Jared has a good list on parishioners who should come with warning labels:

2. The young guy who likes it when you rant against stuff or preach angry. Beware of pleasing young men too much. Young men are notoriously stupid. (I know, ’cause I am one.)

3. The guy or gal who doesn’t like it when you rant against stuff or preach angry. Comfort the afflicted and afflict the comfortable. If you’re sincerely and reliably preaching the Word, toes are going to be stepped on from time to time. If you’re not being self-indulgent about it and you are speaking the truth, beware those who think you should be more “positive” like those fellows on TV.