Dude, you need to take it easier on yourself.
I'm pretty sure anyone who's worked a job with passion at some point in his or her life can have a similar reaction to someone giving him/her insight on a subject he/she is supposed to know better.
Was it worth it? Was it THAT important? Just let it go, man. You made your point, people will do with it as they please. You're just getting upset about it, trying to prove that you, in fact, know what you're talking about. I'm guessing from experience it is not the first time.
/haveakitkat
