I see a HUGE difference between calling someone names and thinking a behavior is immoral (which is the definition of the word in question.) Having an opinion is not the same as judging. EVERYONE has opinions.
My point is that the person who wrote that post was slamming anyone who had the opinion that the action of teenage sex is immoral. That poster said nothing about calling names, they were talking about beliefs. Believing an action to be immoral is NOT the same as calling some immoral. Everyone behaves immorally at times.
I swear I responded to your earlier post last night, but the post is not showing up. Must have gotten lost when I had to login again after writing it.
In any case, in the lost post I said essentially what a bunch of other posters have said. Yes I do think that anyone who thinks in terms of degrading terms such as "slut" (the word I used in my earlier post) is an idiot. (More of an idiot if you *call* a girl a slut, but still an idiot to *think* of her as one just as with any offensive slur thinking it is still pretty bad in my opinion even if one keeps it to oneself.) And if you apply that word to teenage girls but not boys for the same behavior, that is obviously sexist. Hence, sexist idiots.
My post was a response to the earlier discussion of how a girl would get a "reputation" in some poster's circles if she was known to have gone on an overnight trip with her boyfriend. At least two posters made clear that these things are talked about, that it is only girls who are judged this way, and that "slut" is the word that would be used amongst adults who knew about the overnight trip. Maybe I should have quoted them specifically to indicate I was replying to that conversation--the implication that parents should consider that their daughter is going to "get a reputation" if she is allowed to go on an overnight trip.
I have reread my earlier post and cannot find the word "immoral" anywhere in it (unless my eyesight is failing me). So no I was not talking about people who simply find sex between teens immoral. I don't think it makes one an idiot or sexist to believe that sex before marriage or whatever is wrong. I find it a completely implausible and still see no reason to care that others think this or to change anything about how I live or would parent as a result of it. But yes as you say thinking/saying "x is immoral" is very different than thinking/saying "Jane is a slut." That is why I used the word "slut" and not the word "immoral."

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Of course that would be a whole new thread