That's completely unnecessary and also often openly breaks a lot of social rules, but people will justify their terrible behavior, the majority will have their back and tell the target of the abuse that they deserve it, it's their fault and the abuse will promptly stop if they will just "stop spouting nonsense."
Only it probably won't. Caving to the demand to pretend to agree will probably be permission to continue to be awful perpetually to someone who once openly disagreed.
The most abusive people typically claim they are being scientific, only they aren't. Because actual science is founded on the idea that we can't really prove anything. We can only disprove things and our current science is all the stuff we have some degree of confidence in because it has yet to be disproven and overturned by something better.
A good example of this is Bigfoot. There are people who believe strongly that Bigfoot absolutely doesn't exist and anyone who allows for the possibility that Bigfoot might be real gets treated like an idiot and a lunatic, never mind that you cannot prove a species absolutely doesn't exist and new species get discovered all the time.
Bigfoot Anti-Believers are typically far more fanatical than Bigfoot Believers, far less rational and far more out of line with scientific principles, yet will justify their terrible treatment of Bigfoot Believers -- or even people who say "I dunno. Could be." -- with claims that anti-belief is scientific.