Excerpts from Penguin reviews of the lecture (which are still posted at the link Goat gave):
"Lastly, Bob may be a ‘functioning alcoholic’, but witnessing him repeatedly fill his coffee cup with (what I presume to be) rum and coke was very much out of place. Even President Obama manages to keep his smoking habit off camera."
"What a car wreck ! ive know bob casiddy since I was a kid when I spent almost every Saturday at the Mecca magic store in east orange new jersey where he was employed and taught me many things..
I am a student of much of his work. I’ve read and own many of his books.
I was a member of his on line website thing for a short while as well.
First to watch a man with an admitted drinking problem fall off the wagon in plan sight"
"Bob Cassidy is a huge influence on Mentalism today but seeing him drunk was a heart breaker. I was a real let down to see him in this pathetic light"
"Lectures and Booze don't Mix: This was my intro to Bob Cassidy. I watched with friends from my magic club who thought this was embarrassing and these are guys in their 20s who love going out on the weekends. Cassidy obviously has a lifetime of work to share but I felt sorry for him. The longer the lecture goes the more he slurs his words and rambles on and on with a rabid dog look in his eyes. I felt like I did learn some things but not being able to lay off the booze to present the lecture was disrespectful to Penguin and the audience."
"You can learn more from a drunk Bob Cassidy than any other sober Mentalist in the business...No but really this has to be one of the best of the Penguin Live videos produced to date"
There are many positive reviews posted, but I only excerpted the comments which relate to the apparent state of the lecturer.
So while Mr. Goat may not be the most pleasant person sometimes, he was not alone in his opinion. And he has also written nothing libelous in this thread. He has only expressed his opinion, and pasted reviews here which were (and are still) posted on the Penguin website. I also note that Mr. Cassidy has not denied the main issue.