Suppose it's just hard to see people like him, Billy Bragg etc actually seeming to get stupider as they get older, when they once seemed so smart and incisive.
It is hard when it's people you used to admire. I've never cared for Billy Bragg, I always thought his voice was utterly dreary, so while it's disappointing that he turns out to be fully on board with a woman-hating ideology, I also think, well, at least I didn't waste several years paying money to listen to him. Stewart Lee, though, is someone I used to like. I've seen him perform several times, and contrary to what people are saying, he can be extremely funny. It's not as if the audience just sits there clapping self-righteously while he stands there saying "People who voted for Brexit are racists!" He has always seemed to me to be far more nuanced and sophisticated than people have given him credit for.
Let's remember too that he has personal experience of the consequences of closing down free speech as a result of the attacks by Christian groups on Jerry Springer: the Opera (which is brilliant, by the way).
So yes, it is a massive kick in the teeth that he is too cowardly to stand up for women or even to stand up for his old mate Jerry Sadowitz. He's not so stupid that he doesn't understand what's at stake - and if for some reason he doesn't, then he is perfectly capable of doing the research to inform himself - so it is, unfortunately, pure cowardice.