It is encouraging avoidant behavior, which is not necessarily a bad thing. Given a job you don't want to do at work? See if someone will trade with you; they might not mind it so much. Assigned a task for what you consider a bad reason, like covering someone's a**? Come up with a more productive solution and try to convince your boss. Trying to "get out of something" isn't negative; sometimes it just means convinving others to use common sense or pooling your resources (time, effort) with someone else.