I wouldn't say anything nasty to any of these celebrities in person, and I wouldn't post it here if I thought that there was one chance in a trillion that any of them would read this thread. Actually, while I laughed at Bill James comments about Mossi in his Historical Baseball Abstract I have always wondered about the decision by James to include those comments in a book that millions of people might read, with the chance that Mossi might learn of the comments and be offended.
Julia Roberts has said worse things about other people than anything posted here about her---and, yes, while it is an overstatement to call her "ugly," as far as celebrities go she is at best ordinary looking. If I encountered her in a grocery store I absolutely would not think she was the most beautiful woman that I have ever seen.
What are the standards to use when posting opinions about celebrities? For that matter, many, perhaps most, posters here have made crticial comments from time to time regarding the performance of Reds players, but that doesn't mean most of us would, if given the opportunity to meet them, immediately start telling them how rotten we thought they were in a particular game. There is another thread about singers posters do not like. I mentioned Rascal Flatts and Madonna as being singers whom I think are not good singers (or words to that effect). Well, as professional singers go I stand by that comment, but I fully realize that they are far, far better singers than I am. For that matter, I am probably uglier than any of the celebrities mentioned herein.