Why are a lot of people still against interracial relationships/marriages or harassing people that are in it?

I remember getting nasty and horrible looks because my first boyfriend was Latino and I’m a white girl. I’ve gotten horrible comments and even some relatives nagged at me for not being with a white guy. My other ex is white and I didn’t get those reactions and people were more okay with it. I understand most people prefer to stick with their own kind and I understand their point of view, but love is love no matter what. Even some of my relatives said I should stick with my own race to avoid harsh criticism and brutal back lash of being in a interracial relationships.
I’m not going to reject a man if he isn’t white. That’s racist. A girl I know from college gets taunted, harassed and gets harsh criticism because she is engaged to her fiancé who is white and she’s a black woman. Some of her relationships don’t approve at all.
People are never satisfied.