But let's turn this around - have you actually read any of them, or are you just saying "meh, feminism, not my thing" and discarding them out of hand?

Based on the ones I've read, both "Dromedaries" and "His Masters Voice" are very much radical, especially if you read them in their historical context. You can certainly argue that ultimately, the topics and stories are a bit more familiar nowadays than they were then, but they're still quite thought-provoking. (If you read one of those two, I'd go with "Dromedaries". Lem is many things, but certainly not an easy read)