It's totally discriminatory. And I vehemently disagree with the baker's bigotry. I wouldn't do business with someone like that.It can’t be discriminatory practice if the baker doesn’t offer same sex wedding cakes regardless what the sexuality of the couple is!
But we're all entitled to have our biases and preferences, and to act on them. To me, it's insane to have government going around second guessing our decisions in this regard.