It's because of behavior and people like this that make those who oppose LGBTQ people dislike people in the LGBTQ community. People become transphobic and homophobic through this toxic behavior and attitude. As this behavior is common among a group of people, the transphobe/homophobe will view ALL trans and gay people as crazy "SJW" types, which will lead to them saying nasty things such as "That's not and will never be a real man/woman" when a trans woman or man asks to use a certain bathroom, or "Keep your political agenda out of my face" when they see an innocent gay couple kiss. It's general homophobia and transphobia caused by blokes like the Twitter crazies and the Tumblr loons making us all look bloody insane.
This is why when someone says "You're a lesbian and sane" and "You should be the face of all lesbians" to me I am both flattered and mortified. Flattered because, well who doesn't like a compliment, but mortified that I am an EXCEPTION and not the NORM. I know, I should be happy I stand out, but according to them I am the "good example", which sucks because it reminds me that there's so many SJW-type LGBTQ nut bars running around that I, a frankly normal person that is just living her life, am an EXCEPTION. I am an exception because the "others" are presented to the general public thanks to social media and the news as freaks and weirdos and, yes, bigots.
And that is my personal theory on how LGBTQ-phobia is spread by other "SJWS" and people of the like, making people like me once upon a time, skeptical and even hostile and snotty towards LGBTQ members. This is just something I needed to get off my chest. It's not a perfect theory, but that is what my brain thought up.