To be fair though, if you believe people from antiquity had some highly problematic views (no doubt), then wouldn't it be easy to extrapolate that people a hundred years from now are going to look on your beliefs in horror? I cant imagine slave owners thought they were bad people either. It's easy to write it off because you'll be long gone, so who cares, but we'd be a much better society if we realized a lot of what we think is fundamentally true tends to historically go in and out of fashion, and the people that are out of fashion tend to have ideas most of us havent heard. Again Im not arguing for his views, Im just saying, the reason we have the concept of logical fallacies (ad-hominem being one of them) is history is long and these ideas have worked well.