@chris Different people have (defacto) different rights.

Women get lesser prison sentences than men, and children are given special consideration.
The elderly can be spared punishment, and so one and so forth.
And that's just the legal system.

Special considerations must be applied to homosexuals, for the same reason: they are different.

For example, married couples get tax deductions in most if not all western nations, since couples make children, and the state wants to incentivize this for obvious reasons.

Gays should not be given tax deductions for being married, because they don't produce children.

That's just one example though.
They should be barred from donating blood, and adopting children too, for pragmatic, and very sad, reasons.