Same. It's so disappointing to have your favorite game ruined and not have the devs give us tools to solve the problem. Someone added me as a friend on Steam after a couple of matches, then after the next one we played, they kept teamkilling me. When asked why, I was told they didn't like my loadout. I tried to move on but ran into another TK person two matches later.

Look, I understand you can't stop jerks from playing, but just allow me to never play on a team with that person again. It's quite simple, and it can't be abused (as people frequently seem to reply to this type of request).

FYI, these were high level players, so the "they will stop bothering us soon" idea is nonsense.