The way I look at it is that anyone who gets upset over trivial details like that is almost certainly unimportant. If they were important, then calling their bluff on something so minor wouldn't be taken as an attack on their usefulness. Minor things only become major things if the person demanding them has nothing better to do.

99.9% of the time when you call peoples' bluff on stupid shit like pant color at a talk, nobody cares. Most people who demand that sort of thing have better things to be worrying about.