Personally I think it is just a matter of being on social media. Nowadays people are more self absorbed and think that everyone should hear their opinions. Instead of scrolling past they make sure you are aware how they don't like it and that their thoughts and feelings should be put out for the world to see. I always think of that funny phrase "opinions are like a$$holes. Everyone has one and they all stink."
You're right too, that some people do get on here trying to see what havoc they can create. I understand where you're coming from I've seen and experienced similar issues but I do think that there's a lot of miscommunication. Because in type you don't have tone inflection. Many of us are taught in school to type and word things without emotion and in as few words without any indication of body language or tone. Many also automatically read in a negative voice. So they are automatically setting themselves up to be offended where the author might not have intended. I have that issue in text with my Hubby. I'll be busy need to make a quick response and he read it with a negative voice and asks why I'm mad. People should give the benefit of the doubt and move on if they don't like something. They are strangers. Even if they're not its not worth it. Surround yourself with people who lift you up and scroll past the clueless idiots.