Many who are not good enough to assert themselves in real life do it
on social media.
I think he's probably like this in real life actually. It's just that he requires constant validation to keep his demons at bay....latent insecurities and general life unhappiness. Someone needs to be blamed for how he feels - and that's what we are used for - a target to direct his life frustrations and assert his higher worth compared to the rest of the earth's humans.