It depends. I do ‘right people off’ who have questionable principles e.g. misogynist, racist, lacking compassion for others (people or animals). However, I’m a card carrying leftie (left of Centre) and believe Brexit is hugely damaging to the British, but I wouldn’t right someone off because they were a Tory or voted for Brexit if they seemed otherwise to be a decent person. I’d enjoy a mature discussion of the issues and we’d probably agree to disagree. So, for example, someone like Katie Hopkins, I wouldn’t waste any of my time on, but I quite like to listen to Tim Monthomerie, Conservative Home, because he is a reasonable, pleasant guy who will consider alternative views, even if he then rejects them.
Mumsnet is a place where there are lots of people who can’t tolerate a view if it disagrees with their own. I often find the vitriol thrown at posters in unprovoked attacks because the attacker takes issue with something the victim said, shocking and disgusting!