I’m not familiar with the situation you’re referring to, but my experience was different.

From my side, the collaboration was positive and genuinely respectful.

Just wanted to share another perspective.

That isn’t necessarily “different”. Someone with truly horrifying opinions can be genuinely respectful and pleasant to work with, unless you fall into the wrong social group. (I know nothing about this guy’s opinions and don’t have much reason to care, either, I just feel the need to point out how people tend to overestimate the alignment between “nice people” and “people I agree with”. Much as they do the one between “nice people” and “people it’s worthwhile to listen to”, but that’s a story for another day.)

Thousands of serial rapists, murderers, and abusers also have the ability to be very positive, funny, and genuinely respectful to others when they choose to.

Would you like to share another perspective for them too?

By the sounds of it you're sharing the only perspective with any validity so far.