I get your point. Personally, as far as philosophers go I would expect them, at least, to live better lives than any artist or scientist, but even then it’s quite a gray area. And for those living in antiquity it’d be hard to know exactly how they lived, apart from very broad details. Myron could be a serial killer and we’d never know.
Anyway back to Gauguin, you’re right about the subject. On the other hand how many famous painters left us works about Polynesian people? If any racist or sexist views were actually reflected in his work, then yes I would object to it. Mind you, there are people who claim that Dali’s political and misogynistic views are projected through his paintings, but for the life of me I can’t see it. Perhaps it’s just my bias (or theirs).