I think of this in a bit of similar fashion if someone came to Eu 1 and told me: "You're a fucking bad archer, go play siege or rageball and leave battle for melee you teamhitting noob". Whilst it may be true, I still wouldn't like it.
I'm banning both for griefing for a day. You may call someone a bad goalie, but all the goalies have been bad at some point. They don't get better if they don't play, and you're both doing your best to prevent that.