[k2blader]

It, quite simply, singles out a politically unpopular group, and tells them that the courts are closed to them for discrimination suits, but not for anyone else.

I assume you're referring to homosexuals?

Why shouldn't the courts be closed to them for discrimination suits?

Homosexuality is a chosen lifestyle. It is not something that cannot be helped, like race.

[jude24]

Because the Constitution neither knows, nor tolerates, classes amongst its citizens (Plessy v. Furgeuson dissent).