
There's something almost mystical about being anything other than a white, heterosexual, cisgender male. There are good things and bad that you can say to these people. I will specifically list some of the worst I've heard/been subject to.
These are grouped by region of LGBT:
1. Transgender
"Oh, you're just gay." Or "You're just confused."
My personal favourite? "Don't do anything too rash before we get you un-confused."(this was said to me.)
2. Bisexual
"You're just gay and don't know it yet." Or "Just [effing] pick one."(angry tone)
My personal favourite? In a condescending tone, "just pick one, sweetie."(also said to me)
3. Asexual
"You like sex and you know it!" Or "You're just gay and don't want to deal with it."
My personal favourite? "I've seen your internet history!"(also said to me) Yeah. Like seven years ago. Explain that mental stasis, please.

4. Gay/Lesbian
"I'm sorry you've made this decision." Or "You've just been rejected by [opposite sex] too many times."
My personal favourite? From best friend: "As long as you don't have a crush on me."
5. Unsure/Queer
[see '2. Bisexual:']
6. Genderfluid/Neutral gender
[see '1. Transgender:']
Obviously, this list isn't all-inclusive. I did only the ones I've encountered. The "personal favourite" were all ones I have heard and to this day still look back on and laugh at.
Yes, I identify as asexual and transgender. No, I don't care for sex and, as a result, will not transition. This is also because of a mixture of anxiety, self-esteem issues and my mother refusing to accept me, despite many interactions on this subject. "Mama, I'm transgender." "No. You're just attention seeking." And I don't want to put up with her ridicule.
Leave a thumbs up if you can sympathize with this!
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