If BadWords plugin has autokick when bad word is used enabled, it'll automaticly kick everyone who says password, even if password is not on badwords list.
This isn't a bug. I had "ass" on my badwords list and it caused this problem because "password.
At #supybot-bots I was told "Mkaysi: you probably have 'ass' in the list of badwords. which is contained in the word password. :)"
The problem can be fixed by command:
config supybot.plugins.BadWords.requireWordBoundaries True