Here is an decent - if somwewhat long/invalid list of my Fh pet peeves, that may/may not apply to anyone else.
1. Incorrect grammer. I have friends who use /real/ grammar, and y'know what? Here is a quote from another forum; 'Notch says 'no', because it is shorter and easier to type than 'yes'.' Referring to text-talk. Just try to be decent about it.
2. People telling me I suck. Flat out, no warning, nothing going wrong, and then -bam- 'U suck. Go dai.' Wth? Really? Okay, give me reason, first off, and second off, use correct grammar while doing it.
3. Trolls. Now, I have trolled the game.. once. It was pretty darn fun, too, to go into a den and disrupt peoples' illiterate fun. I know, you reap what you sow, but still. I don't mind people that do it, but just do it with class. All I ask.

Sorry if you hate me, just my opinion. And I personally have the right to voice it. :3.
4. Mate-beggers. I could fit them into my mouth and chew them. Into /pieces/. My god, if you reallly want a mate, go ask a IRL friend, and watch them stare at you, grossed out. Now, take that, and /put it into FH/. Your basic reaction from literate people.
5. Know-it-alls. Why? Cuz they know very little, and act like they know plenty on a game just to bore the /crud/ outta you. Not interested, thanks.
6. Powerplayers. Get out of FH, your not wanted, whether on a noob level or any other. :3. I don't care /what/ you want me to reac like, your not gonna get it, so no point in tryin'.
Okay, I guess that's it. Don't go hatin' on my opinions. :3
Oh, and here is my saying. 'Mate beggers are hate beggers.' (c) me. :3