Why are some gay people (mostly guys) like this?

First of all, I consider myself a straight **** guy, which shouldn't be a contradiction of terms.

Now to your Q: was this a ****/gay owned store? in a gay district of a city? Did the line-cutters already know the guy serving you? If so, they might feel entitled to special treatment

But how did they know you were hetero?

Or maybe they were just kidding and playing around (most likely reason)

That's what straight people and their homophobic ways have done to gay people.

You ( not personally) have basically created your own Frankienstien monster.

Youre just trolling

and you aren't doing a great job at that^.^

Because gay people are fake

Just like reverse racism, it's a natural response to oppression.

That doesn't make it okay, it will die away when all the homophobia is gone.

"Reverse homophobia"

theyre probably joking. you should've played along and said "i'm gay" lol get a sense of humor