That's when you mute them and just focus on yourself in the game, and to maintain your own play. Look at it as a practice game. There's really no excuse for AFK'ing just because you're mad, that's extremely childish.
If an adc ever complains about the way I support, I tell them that's fine, and I'm sure other lanes would appreciate my help more. I then roam and mute them and let them do their own thing bot, where they only realize they need me and just screwed themselves.
Secondly, how do you know you're the only one who spends money on the game? Even if you were the only one, that doesn't give you any kind of immunity or make you more special. It's yours, and only your decision, to pay money in this game, and even you don't own your account, so it's more like a donation of money. I myself have spent quite a bit in RP and my husband has gifted me 100k RP on two occasions alone. I don't think I'm special for it, and if i were ever to lose my account all that money would be out the window as well.
Also, I love how you're bronze V with 8 LP and call other people noobs. I've seen bronze V games....it's....oh my, incredibly painful to watch. If you're stuck in bronze V im sure you belong there. Especially seeing a rabadons rush on kat, BOTRK coupled with trinity force and essense reaver on MF, a roa and rabadons rush on eve before jungle item...yeesh. Look at yourself, buddy
[slayer-jinx-catface]