I tend to foe a lot of folks and I think a lot of people foe me. I'm opinionated and outspoken and I can't stand stupid players. Usually in games with more than 2 players, there are quite a few players that will demonstrate poor strats.
1. "Allying" with dominant players. How is this a winning strategy in standard, non-terminator games?
2. Turtling when there are dominant players. Again... if you want others to do your dirty work, that will only take you so far.
3. Constantly attacking an opponent when there are dominant players on the board. What the hell? So you both get weaker while the other guy gets stronger?
4. Breaking a bonus of mine when you are clearly going to lose. Ok... this one is a bit selfish but people please listen! Don't break my bonuses if you are on the way out. Break my opponents' bonuses. Thanks!
5. People that juggle multiple Real Time games and make the rest of the board wait nearly the full 5 minutes. Grow up.
6. Complaining that I am taking advantage of your moves in another Real Time game. Yeah... you play multiples and make me wait, then I'm going to watch your other game and I'm going to burn you alive while your attention is elsewhere.
7. Complaining about taking advantage of Freestyle in 1 v 1 games. There are a lot of players that live by some code of honor. Does anyone think that real war is won by codes of honor? Read Sun Tzu people - one of history's most respected generals. (If you want to play real time freestyle then do so... 1v1 standard game freestyle - all bets are off)
I cannot stand any of the above and I will tell people. If they cannot get it then my blood starts to boil

and before too long... someone is getting foe'd. Me, them or both!
Some of the above is tongue in cheek but most of it is spot on.