"Neil deGrasse Tyson

I worked at the bookstore in college, and would pick up extra shifts working late night events when I had time. NDT was giving a speech, and holding a little meet and greet afterwards. I signed up to run a table selling his books.

After his speech, he comes in to the hall where I've got my table set up. He comes over, introduces himself, and asks which of the 2 books I liked better of his. 20 year old me has no idea who is he and didn't read either book, so I replied "I actually haven't read either. I'm just picking up an extra shift for the store". Well then he starts a 2 minutes rant, berating people my age for not being interested in science, didn't know who he was, blah blah blah. He finishes, I gave him a dumb blank stare, and he walked away. Talked down to me in a way that just made me feel like sh#t."

"My brother met Gene Simmons backstage at a show he was playing in. Gene complimented my brother highly on his guitar playing, but then said, 'Too bad you'll never make it' and just walked away."