First - his example of the 'hater of the pop singer' I think is wrong.
Someone likely 'hates' the pop singer because their popularity is not justified, i.e. lacking talent or authenticity.
They don't 'hate' an obscure pop singer, because there's no point.
This is not arbitrary disdain.
I think a better example would be the comments section in HuffPo or Breitbart on politics. It's just pure political identity and nothing else: all actions of the opponent must be bad.
Second - I think his characterisation of 'loser' might be very wrong as well. A lot of very rich dudes got that way by being obsessively competitive, sometimes full of arbitrary rage at 'the other guy'. 'Vendetta' is not a word we usually associate with losers, I think it comes from the same place.
It just might be that anger is a little stickier and motivating than other things?