In defense of the OP, I believe she could have chosen a different word than "protect". However, I am sure her intentions WERE NOT to insult anyone. The whole tone of her post is very apologetic for even asking but it certainly shouldn't be insulting for her to be asking questions concerning her own children.
I too had concerns when my children were younger simply because they had never been around any GLBT couples. I just felt that I'd rather not be discussing it in a public place... just like I wouldn't want to be standing in line explaining sex or anything else surrounded with people. But, you are also right in the fact that when the subject did eventually come up when she was older, it was merely mentioned and off to another subject. We have been lucky to have not been exposed to any indiscret PDAs by any couples, GLBT or otherwise, so far. IMHO, I would prefer not to be a witness myself to some of the things I have heard go on!
In answer to her original post. I imagine the crowds will be much calmer after the weekend so you have made a good choice to avoid crowds by going during the week. Have a fantastic time!
You are from basically the same perspective of the OP, so it is impossible for you to know just how nasty her comments were. Try to imagine it from a different perspective. If I said to you that I don't want my daughter around your "kind," be it based on your skin color, your religion, your eye color, your weight, your sexual orientation, or any other factor that strongly defines who you are....is there ANY amount of apologizing that could make it less insulting? If I implied that my daughter needed protected from the likes of you, is there anything I could possibly say or do to take the sting off the intent of my post? Saying ugly things in a friendly or apologetic tone does not make them less ugly. If I tell you with a nice warm smile that you are fat and ugly (you're not! I'm just using this as an example) and I don't want my kid around you because she might think it's ok to overeat, would
any amount of apologizing make that any less cruel?
One other comment (to anybody worried about this) about explaining the issue of sexual orientation to your kids. Stop focusing so much about the sex aspect. It makes y'all sound perverse.

If you're standing in line and your kid asks you about a gay couple, please don't bring sex up! That would be odd! Being gay is about who we LOVE way more than who we have sex with. You don't have to explain sex to your kids in regards to gays anymore than you explain sex to your kids in regards to your OWN relationships. Unless y'all got a lot more excitement going on than we do, sex is a very small part of all our relationships. When explaining same sex relationships, it really is as simple as telling your kids that some boys love boys and some girls love girls. They don't want to or need to know what anybody, straight or gay, does behind closed doors. Love is about commitment, families, holidays, vacations, grocery shopping together, watching football together, gardening, cooking dinner, and cleaning house together. We do all the same exact things that you do...simply with somebody of the same gender. Sex is no more a part of who we are than it is a part of who you are. It's fun, we do it sometimes, but 99% of our life is the same, dull, day to day stuff that you guys do, except we prefer to do it with somebody of the same gender. It really doesn't have to go into complicated explanations for young years! Kids understand family! They don't understand sex, nor do they need to. Explain it in terms that they are familiar with and I swear to you guys, it will be simple and painless! I have never heard of anybody say that it was difficult answering their child's questions about homosexuality. Everybody dreads it, but when it finally happens, it is the most non-significant issue in the world to them.
By the way, I hate PDAs too.

Ick! I think there are a lot of rumors going around about what is happening at gay days. Don't waste another minute of your life thinking on those rumors. The vast majority of people I know who have gone to gay days have seen nothing more than some couples holding hands. Now and then a gay couple might share a quick peck. Only on the rarest of occasions does somebody *really* see an inappropriate PDA between two people, either gay or straight and even on gay days. If anybody tells you that gay days are full of obnoxious behavior and PDAs, you may count on it that they are lying. I've been to gay days and I know many people who have, gay and straight, and the rumors are just that...ugly rumors designed to bring homosexuals down. Sure, you may have the bad luck of running into a stray couple who has something to prove, but they are the exception and ten to one, you'd see it on time to turn your kid the other way. I almost get the impression that some people are convinced that at gay days, they have to put a blind fold on their kids to keep all the sex out of their eyes. It
really is not like that! Most of us, in fact, would get majorly pissed off if we saw one of "our own" behaving that way. We know it makes us all look bad and none of us want that!