It's an insult to pepper your audience with profanity when they took the time out of their day to pay attention to what you had to share. It shows that you did

It's an insult to pepper your audience with profanity when they took the time out of their day to pay attention to what you had to share. It shows that you did not take the time to properly prepare and present your arguments. It shows that you are immature. It shows that you have a complete and total disregard for even the most basic of social forums. And it shows that Mr. Holman is so self-absorbed that when confronted with what in polite society is considered ill-mannered and poorly timed swearing in a presentation, he doubled down and bereft of supervision decided to lecture the audience even further as to why he was entitled to swear at them. In a time of crisis, some swearing is appropriate to convey urgency to the listener. At a nerd meetup? Hardly.