The KKK, the American Nazi Party, and Heroin use are all CHOICES. I know not everyone will agree with me, but being gay is really not a choice; it is a characteristic you are born with, just like any other characteristic...and as such, WHY should anyone CARE if someone is gay or straight? It's not like disagreeing with the values of the Nazi party...it's more like disagreeing with the values of green eyes
So yes, you're intolerant. Your discomfort is based on something people are born with, not anything they can control. Am I intolerant of your beliefs? Yes, absolutely. You choose your beliefs. Am I intolerant of homosexuality? No, I'm accepting, in fact...be what you were born to be. Be a good person and I don't really care what gender you're looking for romantically.
Now, I'm anticipating that there will be a group of people arguing that being gay is a choice...but let me ask you, could you choose NOT to be straight? I am a straight woman, totally supportive of the gay community, but I certainly couldn't choose to be a lesbian...it just doesn't work for me; that's not what I was born to be.