to a coach's or player's face? I don't think that is fair.
Proper tone:
Why are we rushing 3?
We should blitz more often.
This team looks unprepared.
______ had a rough game.
Improper tone:
Tuiaki is an idiot.
Fire __________.
_______ sucked and should be benched.
________ is a jerk, was arrested, has a past, etc.
I wouldn't say any of the proper tone lines to a coach. But on a message board? Great to have your mind changed or have someone smarter than you counter your opinion.