That clears it up - I was under the impression that you were arguing that it was appropriate behavior and that the tour guides should expect to field hostile questions. No problem. :-)
But it's not a "nasty mob", and it's not equivalent to throwing feces, as others have been insisting and I have been arguing against.
Again I agree. I don't think that "mob" was too strong as it has many connotations. The original posters surely didn't mean it in the sense of being destructive.
I agree that "throwing a turd into the holy water" was hyperbolic. In reality it would be the same as approaching a bible Q&A session and then asking a lot of seminar caller questions with the intent of disrupting the session.
I am arguing that, to some extent. They're dealing with the public. They can expect some to be hostile or rude. It's a peril of the job. Just a tough day's work.