Three comic creators have yelled at me:
Carmine Infantino. Asked him to sign a Star Wars comic that he'd drawn. He said he didn't have anything to do with it. I said his signature was printed on the cover. He got really upset and proceeded to rip me a new ***hole. David Spurlock, who was representing him, stood behind him and just motioned to me to let him have his rant. That was fine. It was an honour getting chewed out by a legend.
D**k Giordano. Another creator who was on in years. I asked him to sign a Wonder Woman comic he'd drawn. He had all these sharpies with him and I asked him to use gold. After he signed his name, he looked at the cover and freaked out. He said my choice of sharpie ruined the comic. I didn't really care. But he got REALLY upset and started yelling at me to the point where I thought he was going to have a stroke. His wife, who was with him, kept trying to calm him down. Oh boy.... but as with Infantino it was an honour getting chewed out by a legend.
Frank Cho. It was a slow Thursday or Friday at a con and I noticed that he was just chilling at his booth. I had a few New Avengers comics with me that were previously signed by Bendis. There were only a few books and I asked him for his signature. He then went into a rant about how scumbags like me were ruining the industry and that I was going to profit from his signature, etc., etc. I said that I was a fan and had no intention of selling them. But he continued. I'm a pretty calm person and I do my best to avoid confrontations but he was no Infantino or Giordano so I wasn't going to take it. Anyway, after a few choice words, he stopped, I walked away, and that was that.
Only three times out of the many creators I have met over the years have yelled at me. Only one crossed the line.