Also, y'know, false and in many cases slanderous or libelous.
No one's saying throw the guy in jail, they're just calling a bluff which he didn't actually make himself but a combination of his followers, his opponents, and the media created through the magic of social media sharing and inflation of the extremity of rhetoric. Bigots are bigots though, and recognizing them as bigots is not declaring thoughtcrime.
It's a bit hypocritical of you to believe that they're allowed to believe that others are wrong in their beliefs but we're not allowed to believe that their beliefs are wrong right back at them.
If we're wrong to believe they're wrong then they were wrong in the first place for starting this fractal loop of wrongness. XD
Legal action and ridicule are a step beyond the fact that they believe outright false information and spread false information and believe things that are literally untrue.