Seriously. How about wearing a shirt and tie to represent an engineering firm on live TV? Everybody wants to adopt the Silicon Valley slacker vibe.
And while you're at it, shut those people in the lobby up. Yelling and hooting like you're at a hockey game is unprofessional. And looks bad if the thing blows up.
This is one of the more nickpick-y things I have ever seen. They aren't at a business meeting. Possible customers are gonna be watching if the rocket blows up, not if some guy at a computer has a tie on. Like, "oh did you see those SpaceX slobs? I'd rather spend a whole bunch more and fly with some people who know how to wear a tie!" Naaahh
Also, the people yelling outside are awesome. First, because this is crazy exciting, I won't talk down people who are this excited over spaceflight. Secondly, it's great for SpaceX's image and getting other people jazzed about what they are doing. Kinda like their super layman explanation of how orbits work and how the landing works, etc.
These are all good things, imo.