Boyfriend asked my son if he liked any white YouTubers

I'm white, my kids are white, and my boyfriend of 6 months is white. My 15 year old loves YouTube. His favorite YouTuber is Swoop on YouTube. One reason my son likes her is because he has trauma from abuse when he went to foster care while I was in prison and she's very validating. I've bought her merch for him. He likes other YouTubers but the one he mainly talks about is Swoop. Swoop is a POC. My boyfriend out of nowhere if my boyfriend liked any white YouTubers. It was really weird. My son said of course. He watches a lot of YouTube. My boyfriend asked if any white YouTubers were his favorite and my son said his favorite is Swoop so no. And my boyfriend asked why and I told him that's so inappropriate and to shut it. My boyfriend tried to defend himself saying he's not racist. He was just wondering. Especially since my son's favorite YouTuber is not only female because most boys like male YouTubers but also black and he's never seen my son watch white YouTubers, which my son has watched plenty of white YouTubers but what does that matter? It's kind of a turn off for me.