Someone tell me how straight romance can be forbidden

Without putting religion onto it. Cause I swear this person insist that straight people can have forbidden romance, they gave me workplace... Like girl do you live in your work company?? They act like they can't quit the job or work in another company too then ethnicities?? At what country is it illegal to marry someone out of your race. NONE. They said it was illegal but I just search and the last time it was illegal was Hitler era

Another thing is they said, parents... Which bffr they just don't like your s/o but it ain't forbidden. Cause all of this jusf seems really complicated and a hindrance but it's still gonna be successful at the end of the day