Atlo: Joking aside - you could vote to mute players in certain MP games. I wonder if that's still the case.
Mute & play. Just the way it should be. Can't get more like-minded than that.
Except when the teamkilling starts.
Luckily in Team Fortress 2 you can't kill your own team members. In the original Quake Team Fortress and/or Team Fortress Classic, I think it was possible at some point but it was removed when idiots started messing with their own team.
There were other ways to annoy your team members as well, e.g. I recall in Quake Team Fortress when teamkilling was disabled, some idiot engineers would build a dispenser in front of the spawn point exit, as an impediment. Since your team members couldn't destroy the dispenser (teamkilling was disabled, remember?), your team members couldn't exit the spawn point, which was kinda funny I admit but very annoying.
Nowadays there is a votekick option so people who annoy their team will get kicked out quite fast from the ongoing game.
To me, in a team game like Team Fortress 2, for "like-minded" it is enough that:
For my teammates:
- play the game, don't just stand (no I don't like "friendlies" who do nothing in the game) or dabble doing nothing useful
- don't cheat
For the opposing team:
- don't cheat
- don't whine that our team actually plays the game, e.g. captures the flag (= "capping").
I don't mind the whining that much but whenever someone starts that same old whining, I ask them:
"This game is all about capping. Why would you join a game where the objective is to capture the flag, and then start whining about other people actually doing that? Do you also whine if people score goals in football, or throw the ball to the basket in basketball?
If you don't like capping, wrong game buddy. Play Fortnite instead, it has no capping.".