There are many types of people on Wikipedia:

The Vandals - people who wreck articles as a joke or something along the lines of humour.
The Assholes - people who remove your recent edits even if you were right for stupid reasons.
The Editors - people who edit and expand Wikipedia.
The Human Bots - not sure how but they always seem to revert vandalism 2 seconds after it is posted, but are still human.
The Micro-managers - people who read through an entire article looking for any spelling mistakes.
The Cool Guys - people who cite your material if it has no source and try to prevent your edits from getting removed.