Lol. Easiest way to counter that = deactivate chat completely.
Really dude. People with bad mouth are everywhere! It's something that we can't escape from. It's either deal with it or hide away by deactivating chat. Then again, one does not insult another without a reason. You could have done 2k damage but by playing with an isolationist mindset ie: you play for your own sake with no regards to the team: and still be insulted on by someone on your team for not helping. For some, it's just natural to insult others.
First ask yourself, did I do something wrong that could have led to the person insulting me? Was I not contributing? If so, then sometimes a little insult isn't a bad thing (though I don't support that entirely) since that is what you may need to improve your gameplay.
However, if you feel that you have been insulted without any reason, then fine, complain about it and send tickets and whatever to get that person for what he did.
However, the fact that you camped on a medium, it's honestly a bad play on your part. Who camps on a medium? If you really want to camp, get a tank destroyer. A person camping on a medium is a sad man. You could have instead enjoyed the mobility and great overwhelming powers of a medium, that is if you're driving a fast medium.

J'ai joué soixante-quatre des chars en World of Tanks.
[M:14/64 | 1er:20/64 | 2ème:24/64 | 3ème:5/64 | Pas de maîtrise: 0/64 ]
Mes cuves premium actuelles: T2 Light, Toldi III et Pz.T-15
Je suis nouveau, mais pas une tomate!