Intentionally killing, shoot, hurting or knifing a teammate.
Intentionally team flashing.
Intentionally team blocking.
Going away from the game multiple times, also known as being AFK.
Being away for a long time on purpose.
Intentionally using molotovs to block teammates.
Flashing your teammates on purpose.
Intentionally running into teammates molotovs or grenades.
Throwing the bomb or weapons in a location that gets them stuck.
Blocking teammates on purpose to prevent them moving or going somewhere they intent do go. Common spots blocked are doorways.
Toxic text or voice chat to you or the enemy team.
Use the voice chat to play music or unwanted sound effects.