I think there are two sides to this. Yes, online aggression has probably peaked in recent years with the rise of worldwide pro far-right misinformation campaigns, no argument there. They were specifically targeted at the people more vulnerable to buy into hate speech propaganda.
On the other hand, I have personally noticed more constructive discussions, even after I deleted most of my anti-social media accounts and substantialy decreased my usage of Internet forums in general. It seems there’s some positive trend in the middle of all that.
Now you got me curious. What’s the argument against Mozilla?