Flying with friends and fellow pilots can be the best times, but it also has the potential to turn into a nightmare. This can happen when the person beside or behind you becomes a backseat flier. While it is important to speak up in cases that could turn into safety or legal issues, constant reminders about things that are not important can be annoying beyond belief for the pilot-in-command.
Some pilots take pride in flying right on the numbers. While these skills are admirable and while you as a pilot should always pay attention to what goes on in the cockpit, being off your altitude by 100 feet when flying VFR is certainly no cause for alarm or a breach of the FARs. Similarly, flying a fraction off the pink line or a few degrees off the VOR needle, again when flying VFR, may get you to your destination a minute or two later, but does that really matter? You do enjoy flying, don’t you?