[MikeJ75]

There is no law in the United States that treats gays and straights differently.

That is certainly not true. I'll give you two examples from the many available.

First, Nebraska has a hate crimes law that treats gay victims differently from straight victims.

Second, the U.S. has the famous "Don't Ask, Don't Tell" law that expels gays from the military. Under that law, if a gay persons says that he is gay, then he is expelled from the military. But if a straight person (poor Klinger from M.A.S.H.!) says that he is gay, he is not expelled. Just saying that you are gay is not enough to get expelled. You actually have to be found to be gay, even if you have never engaged nor ever intend to engage in homosexual activities.

[RAT Patrol]

The military discriminates against a bunch of people for physical reasons. Gays can't donate blood because they are high risk for disease. Why should a soldier have to risk blood exposure and disease that the general public does not have to risk? That's not a fair analogy. Frankly, I think don't ask/ don't tell is wrong. They should ask/tell/get booted out. No one has a right to risk someone else's health.

[Right Wing Professor]

First, Nebraska has a hate crimes law that treats gay victims differently from straight victims.

Point out which provision of the law does that.

Under that law, if a gay persons says that he is gay, then he is expelled from the military.

Nope. and I quote

      That the member has stated that he or she is a homosexual
      or bisexual, or words to that effect, unless there is a further
      finding, made and approved in accordance with procedures set
      forth in the regulations, that the member has demonstrated that
      he or she is not a person who engages in, attempts to engage in,
      has a propensity to engage in, or intends to engage in homosexual
      acts.

Where does it say that it only applies to 'gay people' who state they are homosexual or bisexual?

If you're going to cite the statute (which is good) it's pretty silly to misrepresent what the statute says, since any fool can check that in five minutes.