My boyfriend has talked about this and I think it's a matter of pride/jealousy. He said if a white girl dates outside her race it's like she's "used goods" and I think it's cuz of the whole stereotype of men from other races being "well endowed" and possibly the white priviledge. From what I've noticed with my man and other guys it's also a matter of men don't like knowing a girl that piques their interest has slept with other men. My boyfriend said it makes him feel good that he's my first, and that it isn't the same being with a girl who's been with other men.
i think in cases where a white person gets angry (and i've seen it with black people getting angry with the black person) it can stem from two things
- simple racism. feeling like the person they are with is sub-human or inferior - jealousy, a sort of feeling like why would they get with a person of another race as opposed to person of their race -feeling threatened. essentially the idea that it's one less person in their dating pool and while they may be single they are angry that a person of their race would choose to date outside their race
you need to understand that GaG tends to attract the bottom of the barrel... the MGTOW types who can't compete with the changing dynamics of the world where women have options. Any news which signals more competition for them won't be welcomed... especially when they are competing with races they see as below them. It makes for a good chuckle every now and then, but its not something I'd dwell on. Living a good/better life is probably the biggest slap in the face you can give those blokes