OP, you gave them another chance .. they should be grateful .. although the fact you were clutching so many rounds makes it a virtual certainty the rest of your team would fail. But hey, they wanted to play Gold without being ready for it .. and lemmings walk off cliffs .. not much to be done about that.
I almost never quit out of a game. It's pretty common to have 1 or 2 other players who won't use gels / rockets / ops, but rare it's all 3. As long as there is 1 other person trying and using consumables, i have to stay for their benefit. When all 3 players prove to be leeches, then I can leave.
Although if i'm using a powerful set up, and things are going smoothly, then sometimes I don't even bother leaving when all 3 are not helping.