Negativity in social media

Davvero. Ogni tanto, nei gruppi, c'è gente fuori di testa 

Sea

Being anonymous makes people feel emboldened to say things they wouldn't in person. 

Samantha Bovee

I think part of it is that when we speak to each other we can hear tone while if we type the same sentence it is questionable if it's meant to be mean or not

J HM Tsang

Some people are just mean.

BLK

Maybe it's a case of out of sight, out of mind. As you've mentioned we don't know the person at the other end so some put their negative feedback then scroll knowing that they will never meet that person in their life. Or other reasons.