Do you see instances who’s main purpose is to represent “people inside the more mainstream American Overton window of mid right to far right” that are even nearly as popular as Hexbear?
If you’re browsing all you frequently see posts from Hexbear users. I’m yet to come across a noticable amount of posts from users from an instance which represent the group you mentioned.
(I couldn’t even name a single instance that fits that description, because if they exist, they’re not nearly as active as Hexbear.)
Toxic people exist on all public instances. But on some they’re more common than on others.