If he can't stand to be alone then why are these the best friends he's made after 25 years?

But to flip this another way, you suspect that he might have regressive views. What actions in his life suggests otherwise, for which he is not compensated? E.g., dating you doesn't count because -- to put it plainly -- he gets to nut.

Calling out his friends is probably the easiest place for him to be supportive. He's not doing it. How can you expect him to be supportive when the stakes are higher? Are these guys doing this shit in public? Are they adding to the background noise that makes life harder for POC? 

How much do you care? At current you're in bed with a collaborator. If you don't have strong feelings about working against these shitty attitudes you don't have to change. If the relationship works for you and you're comfortable with the issue of race bubbling up as a point of contention (and likely resentment) but the relationship is worth it, then you do you.