How is that our responsibility when he can't understand that he's not "up there" as he tries to feed us. I am sorry but I can't help but laugh at this whole situation, I am glad I didn't turn into a full of myself asshole that can't even back it up through any current nor past accomplishments. Average in everything is not bad, he can be proud of that considering the state of W:A, he would be a decent addition to most clans, especially when activity is the most important thing atm. But he wants to sell himself as an "elite" player that should be begged to join a clan, which will not happen. I'd suggest training through TUS singles, make yourself a name that you are consistent 60%+ winrate in most popular schemes and then this will look a whole lot different.
There are many people that work their ass off to get the status of being considered the best in what they are doing and a random guy claiming he is equal is insulting to many of them. He deserved this harsh treatment because he created it himself, he has no respect towards those that are above him and is lacking judgement of his own individual skill in the broad sense.