Why is it ok for straight people to talk about their relationships, but not gays?

This is regarding one of the arguments against repealing don't ask, don't tell. A lot of people who are against repealing it say that they don't mind gays and are for equality, but that gays shouldn't be allowed to "announce" their uality to the general public or mention their relationships at all. Then why is it okay for straight people to hold hands in public, have pictures of their spouses on their desks at work, etc? Straight people show us their orientation all the time in public by doing these things and we never criticize them for it. If you don't allow a gay person to have a picture of their significant other out in public for others to see, for example, then you are denying them equal protection and equal rights. It's just so silly that people say that gays are getting "preferential" treatment with repealing don't ask, don't tell. That's so insane. It's the straight people that get preferential treatment with their orientation in public all the time.