> two thirds of the LGBTQ community have frequently or often heard homophobic comments
It sounds weird to use the suffix phobic for something other than a fear. I doubt that the comments that 2/3 of them hear was something along the lines of "don't get close to that gay person or else you'll get AIDS". I'm guessing what they were referring to was comments like "I'm going to continue to call you he even though you insist that you are she". A better word would be antihomo or homo-hating.
I assume homophobic is used to make fun or degrade those people. Similarly to how terrorists are called cowards (even though I don't know of many people with enough guts to die for what they believe in) or calling kids suffering from cancer as brave (what else should they do? Die?).