Ive dated catholic guys in the past and it never bothered me..My son is raised to be catholic, but they're not really practicing, so it doesn't bother me.
When I get married tho, I'd prefer to marry someone that was protestant like me.
My husband and I are basically both non denominational but he wasnt raised in church like I was. He doesnt really understand a lot of traditions so he gets upset. Like he doesnt understand tithes and such. We both believe in the same things though so we just teach that to our dd.