I get it more with United fans but when you support Arsenal or Wolves, you're nothing to do with Liverpool. Chances are, if City had lost to Villa they'd be crowing about that too. It's just such a weird mentality.
If Liverpool were 8th and Wolves were fighting it out with, say, Brighton to win the league - would we care? Would we be singing 'you almost won the league' at the Molineux? And cheering whenever Brighton scored? No, because that's a really weird thing to do about a result that doesn't concern you or your rivals. But that's what banter culture is, it's really weird. In this case, it's hanging on the coat tails of a team that has nothing to do with you, to get some fleeting, reflected glory.
Whatever makes them happy I guess. 
I think it's a product of the age we live in. Look at social media generally. It seems everybody has a deep-seated need to matter. A need to be heard and be noticed.
I think this crosses over into all aspects of life, with football fandom being just one. It's not surprising when you think about it. Look at the Premier League. There is only one legitimate club with a chance of winning it (Liverpool) and two sportswashes (Abu Dhabi and possibly Putin FC). The rest have no chance. Look at the cups too. Unless it's a freak season, it's going to be one of a very small number of clubs that will win those too. So, there is only a very few clubs and sportswashes that are ever going to win anything now, yet everyone still needs to feel that they matter, and naturally so.
Everton are irrelevant in the modern game. Even Man United are barely relevant now. Traditionally big clubs with no real stake in anything anymore. Massive clubs like Arsenal not even making top four because two sportswashes are cuckooing the top four nest. There will be a third cuckoo in the top four nest soon enough too, in Saudicastle.
Everyone needs to feel they and their club matters, but in the scheme of things the overwhelming majority are simply making up the numbers and surviving off crumbs now. Where does that leave their fanbases? Well it sees them having to live vicariously through others. The likes of the Mancs, the Bitters etc feel like they've still got a horse in the race if they piggyback on and live vicariously through the sportswashers.
Wolves have no stake in the title or the cups. Neither do Everton. Very few actually do anymore. But by piggybacking and vicariously living, they attach themselves to a dog in a fight that doesn't concern them. Suddenly, they feel relevant again in some rather pathetic way.
It's the same as babies crying for attention. If they don't get attention by being good, they'll spit the dummy and stamp their feet until they get noticed. In a day and age where everyone is desperate to matter and be noticed, football fans do the exact same thing when their clubs do no more than make up the numbers. They act like twats to gain the attention that their clubs and their football cannot bring them. Everton are possibly the biggest example of this. A fanbase that has willfully descended into feral behaviour and vicarious living in order to claw back some relevance in a world where they currently have none.
So few clubs (and sportswashes) genuinely have a stake in actually lifting trophies now, so the rest are left scraping around in the dirt looking for relevance. One way is to simply be obnoxious twats, and they do that by picking a dog in a fight that doesn't concern them in the slightest, then attaching themselves to it like parasites.
The 'banter culture' allows the irrelevant to feel relevant. It's all about saying "look at us, we still matter, we still have influence" when the reality is they actually don't, and they are just background static.
If Abu Dhabi had drawn or lost yesterday, Villa fans would have taunted them about it. If wolves were playing at the Emptyhad instead, and got a draw or win, they'd have taunted Abu Dhabi too. Neither have any love for Liverpool, nor we them. That's how it would have panned out though.
