There’s a NYT report calling him out as an antisemite in the 1920’s
Sure, but this was at a time where you could get antisemitic magazines delivered to your door, and some people had dozens. There really wasn’t as much stigma on it as now (And I’d argue it could use a little more stigma still). There were lots of places around the world where you could discuss the latest details of antisemitism with your hairdresser, and it wouldn’t even be that weird.