Thanks everyone for the supportive words.
In retrospect the racism wasn't the only bad thing (though it was obviously by far the worst). He also mainly only spoke about himself, and kept going on and on about previous cars he had owned - and these weren't unusual cars or anything - just totally normal cars. Kept showing me photos of them too.
There was also a weird bit where he showed me loads of pictures of his daughter. She was quite beautiful, but even so. He showed no interest in my daughter (not that I would have shown pictures of her, or revealed any details anyway, of course!). So it wasn't an attempt to get me to open up about mine. Obviously just likes talking about his. It's sweet I suppose, but ....
Anyway, even had he been a prince among men, no right thinking woman will go near him when she finds out his views on black and Asian people. (And in a way I really am glad he slipped up so soon - or maybe it was deliberate on his part, as he only wants to date fellow racists?).
I was trying to think how I could suss this out before meeting - I am on the voluntary DEI working party at school (I teach) , and I help a lot for events for BHM and similar. And I have worked hard to make sure our KS3 curriculum features texts by diverse writers (not just dead white guys!). So it wouldn't be impossible to shoehorn some sort of observation about this into conversation, IF I get one who asks anything about my work, life, views etc.....
Seriously, this is something I am really noticing this time round - men who ask nothing! Of the 6 I have now met in person, 4 of them barely asked a single thing about me, and spoke about themselves at tedious length.... Is it because I am less visible now I am in my late 40s? Or have I only just now gained sufficient confidence to think they SHOULD be interested in me, and to resent it when they aren't?