[This is what he re-tweeted.](https://upload.wikimedia.org/wikipedia/commons/7/70/Swastika...) It might be in bad taste but arresting him and insisting he undergo re-education is crazy, and I can't believe you would defend it. No one gets arrested in the US for re-tweeting memes like this.
As for the rest, you're free to call politicians fat idiots without being arrested in the US, and once again, I cannot believe you would defend arresting people for that.
I haven't looked at the particular case, but nazism is a particular thing - given Europe's history it's there for a very good reason in most EU countries.
I don't know about the 'fat idiot', but in most EU countries that's more than fine so I have a bit of a hard time believing that was the sole reason - public figures are fair target for stuff like that. The limit is actually planning or inciting violence against someone or a group - again, the same as in the US.
Yes and US guys are plain wrong on swastika thing - you could even financially support open nazi militants like Azov battalion from most EU countries without any consequences.
Not if you're an immigrant on a visa and talk shit about ICE online.