You wanna play semantics...ok..
Should whites, blacks..mexicans....be forced to use different bathrooms yet have the same rights?
That is the problem within itself. It has NOTHING to do with people other than the ones that want to get married to a same sex partner.
BTW, they are being discriminated against far and wide b/c in many places they do not have the same rights as married couples.
Thankfully, homophobes like you will probably end up having to live with same sex couples being "married" using the term marriage in your lifetime.