My girlfriend is Asian, and the topic has come up a few times.
From what I'm told there's a good chunk of by-country 'cism from parents, usually first generation arrivals. This nudges the kids to look elsewhere. For example, the parents of any Asian person she dated would be super off with her because she is South East Asian, and not Far East. So little things like being late because of the slow buses for a date or whatever, the parents would shoe horn some 'cism there.
Secondly, the potential locked-down lifestyle gets in the way. This is really parent dependent, and is again usually stemming from first generation parents. But it's super strict living when you see someone with that background. I had to deal with it for a number of years, and it can be hard to shake. The mom is a little more loose and I could bend the rules, but with the old man I had to be within his vision if I'm in the house and super on-point with responses.
This was in the younger years, and we're fully into adulthood now so none of this matters anymore, but there is something to it. I've been told it's refreshing to not have to worry so much about parental overreach and issues because she's a darker skin tone.