Its hard to say...it sounds like he ran into some fellow Straight clients that had a grudge against him.
There were like 7 diff Straight programs in diff cities...so there were thousands and thousands of kids that went through.
Dig around on these forums and read the stories, thats the best source of info on what it was like. For many it was a very very painful experience, and most have tried to forget it.
If it upsets your brother, dont pressure him to talk about it. He will come to you ,I imagine, if he wants.
Im sorry to hear about the bar incident as well.
There are some really sick people in the world,
and noone deserves to be treated like that.
Look around, read the stories, good luck and hope you find what you are after.
Just be glad your brother is alive, which is more than I can say for many ex clients.
Peace
Brad B.