Why do I get made fun of for dating a transwoman? Would you do the same?

It's such an annoying thing to me, I've overheard my dad making jokes about it and even my friends are weirded out by it. I just dont understand why it matters so much to other people, if I'm happy isn't that all that matters? I just wish I was more accepted in that sense, it's not something I'd break up with my girlfriend over or anything but it does make me feel insecure about it sometimes. I wish people would mind their own damn business sometimes.
Why do I get made fun of for dating a transwoman? Would you do the same?
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