He will denigrate, attempt to belittle and often pick very bad faith arguments about the smallest of issues.
To give an example of his demenour: https://youtu.be/pHckKckhBYc
There's also this account from a fan, which goes into how he is: https://v1.escapistmagazine.com/forums/read/18.874144-I-need...
He also called PewDiePie "A Racist Piece of Shit Bigot" and while PewDiePie did use a racial epithet and there's no excuse for that, he did apologise profusely and regardless that's not a decent way to engage a stranger. https://boundingintocomics.com/2019/04/02/wil-wheaton-attack...
He will block you for any disagreement; and I don't mean people being crappy to him, anything that goes against what he says: https://steemit.com/blocking/@awgonnerman/is-this-why-wil-wh...
For whatever it's worth his introduction to mastadon was mired in controversy after he bleated calls to have a user blacklisted from the platform for the following joke:
> “Hey, did you watch that awesome show on Bofa last night?”
> “What’s Bofa?”
> points to crotch “Bofa deez nuts down here.”
And when Mastadon wouldn't (couldn't) blacklist the user from the platform he got viciously angry.
EDIT: His fans are on hackernews; please don't "downvote to disagree"; he is known to be toxic and curates blocklists of anyone who slights him in any way. If you disagree, please prove me wrong.
I say this in good faith, as I'm not part of the alt-right nor do I agree in any way with them. But toxic people are of all kinds and we should be aware of those in our camp who do harm to our causes by acting in deleterious ways.
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However, it raises a more valid point about 'what do we do about controversial figures' in general, and you would expect, as with most federated services, to be able to prevent "non-local" personas to be blocked from interacting with local users.
In those situations though it degrades the experience; the best part about mastadon though is that you get to choose who you federate with, so you could, in theory, have linked mastadon installations for government officials (who are often controversial) and signup could be linked with an oauth2 identity system that ties back to a real identity somehow (this would be possible in Estonia with their e-ID systems).