Why do people assume I'm gay because I support gay rights?

People are total idiots.

That..idek. I guess they're a bit egocentric. Like if they don't do it, they assume everyone doesn't unless they're gay.

there are still a few ignoramuses out there unfortunately.

Same thing happens to me

Just a suggestion...if and when you say you support the rights of Gay people, you might start the comment with "Even though I'm straight"....that should make them understand that you are an open minded person

Maybe they think your hiding in that closet?

because people are dumb.