I would rather be told something blunt and to my face than to sugar coat it.
As Buck said in a clinic of his I attended today (just as a spectator): "I'm not trying to be critical, I'm trying to be real."
I had been torn about whether I was going to attend his clinic this weekend, but I saw the movie this week, which solidified my decision. And WOW am I ever glad I went! I learned more from that man in 8 hours than I have from most other horse(wo)men in my entire life. The reports that he's straightforward/blunt/direct are accurate. I wouldn't say he's "rude and crude"--I think our society has just forgotten what it's like to have people tell it like it is. Nobody can take criticism of any kind anymore, even when it's constructive.
I took a few photos, and a ton of notes, but the main thing I took away from his teaching *style* is that you will get out of his clinic what you give back. If you aren't succeeding at what he's teaching you, but are TRYING, he is exceptionally supportive. If you are clearly fighting against what he's trying to offer, he'll essentially just leave you to your own devices and spend his time helping the people who want to learn and are willing to try new things.
I was also completely amazed at his ability to watch so many people at once. The morning class had 30 participants and the afternoon had 20. Buck was stationed on his mount at the center of the arena, and even when it seemed like he was more focused on talking to the audience or working with his horse, he somehow still had one eye and ear on each student.
If you haven't seen the movie yet, do. And if you ever get a chance to go to a clinic of his, go!