Unlike your average drill instructor or stern teacher, there's no rebuke for being late. Not to the first, non-mandatory meeting. Instead, a lot of the introduction gets repeated, profanity included, for Ronnae's benefit.

Shit happens, people are busy, and if he's going to alienate people or make them feel out of place, its going to be because they aren't up for hard work and dealing with the pain of masochistic workouts - not because he wants to make them feel bad for having shit to do before showing up for a voluntary exercise.