A kbin user has the most upvoted comment chain on that post.
https://kbin.social/m/meta%40lemm.ee/t/458933/How-do-I-block-all-of-Hexbear-from-All/top
sh.itjust.works and a 1-user Lemmy instance called lemmy.magnor.ovh also see and reply to Hexbear comments, though Hexbear doesn't see their replies:
https://lemmy.magnor.ovh/comment/2371501
1-Our trump posts are mostly about how funny that piece of shit is, which can definitely be confusing to people who are used to viewing him as some kind of singular harbinger of social decay. We dont view him with any kind of unique horror beyond the horror of his class, which can look exculpatory to bystanders.
2-The "2" party dichotomy is dominant in the US and the left has been deliberately dismantled over decades, so it's a common and easy misconception to think that
There is a lot of anti-republican sentiment, but maybe the person got unlucky and missed it