Meanist

A meanist is a person who hates mean people. Just like a racist hates people of races.

Definition of "mean":
unkind, spiteful, or unfair.
synonyms: unkind, nasty, unpleasant, spiteful, malicious, unfair, cruel, shabby, foul, despicable, contemptible, obnoxious, vile, odious, loathsome, base, low; More
informal,horrible, horrid, hateful, rotten, lowdown; beastly.

As i walked out the door, I noticed someone walking in, so i held the door open for them. Instead of saing thank you, they walked right by and gave me a dirty look. It's people like this that make me such a "meanist"!