What do gay people mean when straight people "show off being straight"?

Everytime you see a question, where a straight person asked why gay people "show off their uality" You get at least one person respond, "why do you show off being straight." Well i want to know what that means. Im not going to get into what gay people do to show off their uality. To long and too much and weve all seen it. Someone give me examples of straight people showing it off. PDA do not count because im uming they are a result of love (or lust) and are not done for the sake of showing off uality.