Are you a fool, a bore or a drama starter?
There are plenty of people I don't like on the web, but who I can talk to in a calm, rational way because while they aren't nice people, they are relatively rational people. They are people you can have reasonable discussions with, even if you entirely disagree with them.
But there are also plenty of people on the web who I've found I just can't talk to because they are not rational. They just...... okay, imagine I am waving my hands in a slightly aggravated manner and going "urgh!" because that's really the only way I can describe trying to interact with them.
The OP (not me - the OP from the post) isn't suggesting you block everyone you encounter. Just those who will not be good for your mental wellbeing.
And I have to say - having encountered quite a lot of people who were not good for my mental wellbeing, I find it hard to disagree with them :)