Hurting the team for a CV is time.
The more time it takes to get less planes in the sky hurts the team.
Hurting the team in a BB is running behind the line AAing the whole game instead of fighting other ships.
Hurting the team in a sub is going after a DD and getting owned by it.
Hurting the team is loading guns that aren't effective @ AA and using the guns as an excuse to why you have 0 credits. (Counts actually to all ships...)
Hurting the team is launching bombers into fighters and losing a wave of bombers repeativly.
Hurting the team is sitting there doing nothing for almost 1.5 minutes every time you load 11 planes on 1 pilot when you could have loaded and launched 4/4/3 in less than 30.
Hurting the team is not launching a plane when you have no red dots on your mini-map (given you have the ability to load planes and can load more than 4 planes on your ship)
Hurting the team is rushing at the start and dieing with no attack within the first 2 minutes.
Hurting the team is playing a BB6 and getting owned by a BB3 or 4
Hurting the team playing a PCV with under lvl 90 fighters. (Your also not getting much EXP lol)
Hurting the team is sitting on the line and not attempting to dodge that salvo when you can see the enemy team.
Hurting the team is any form of leaching (Sitting there doing nothing, or driving around without doing anything for long periods of time)