Nobody is saying it makes them monsters or rapists by proxy, it just makes them friends of a rapist who stayed his friend even after it was proven that he raped at least two people, and then asked for him to be treated leniently even though he certainly didn’t grant any leniency to the people he raped. And they’re free to do that. But disapproving of that isn’t guilt by association, that’s just them making choices regarding their relationship with a rapist that other people are free to judge and criticize them for.