As the daughter of two former British/American lit teachers, I have to jump in the grammar debate...
I'm with Whistle Stop. I hate it when people use plural pronouns to indicate singular antecedents in an effort to be PC.
I love dialects. As spoken language, they're beautiful and fascinating. In formal speaking and writing, however, they can make communication difficult. For instance, if you were speaking to someone for whom English is not her first language, "standard" English would be necessary for effective communication.
Other things that really burn my cookie:
People who move to my side of the Mason-Dixon and make insulting remarks about southerners.
People who think they know everything. (They always annoy those of us who actually do know everything.)
People who treat me like an idiot just because I'm a young female.