Thinking of the bigger picture will help you avoid a lot of conflict today, so try to let the little things slide. If a cheap friend would rather pay just for themselves than split it down the middle, don't point out to them that they're only saving pennies. Just do it their way. And if a coworker needs you to use a certain typeface or certain color of paper for no apparent reason, just go along with them. These are not the kinds of battles you should fight.