It’s very possible that things were always this way, you’re right. My own perception is that politics has become more divisive and less respectful in my own lifetime, and I happen to think that social media makes this worse, but that’s admittedly just an opinion.
To the emotional statement: I think I’d get a reaction if rather than saying “I don’t think Go is a good language” I said something like “Go is objectively the worst programming language ever devised”. I get your point but if you feel emotional about something then say so - IMO the parent comment did much more than that.