I have never heard of a complaint of flushing the toilet too much, and I have lived in different condominiums for nearly 30 years. However, there is a possible non-crackpot reason for the complaint that has nothing to do with Jim's IBD health. In condominiums, in particular, septic tanks can jam up from people using their toilets as garbage disposals for items that should not be flushed, like tampons and shredded paper (I even saw a news article recently about Donald Trump using his toilet to flush documents he had ripped up). In my condo, there has been complaints along those lines because garbage improperly disposed of through the toilet causes clogs, backups and related odor nuisance. And a person flushing the toilet a lot could be suspected of being a garbage disposer.
I don't think that's the case here. I think Jim's neighbor is probably a garden variety crackpot. But I am positing a legitimate reason to complain about, or be suspicious of a serial toilet flusher.
On another note, Jim's post reminds me of the time when I lived in a small one bedroom condo in Branford, from 2000-2002. There was an older woman who lived in the unit directly over mine. Every morning she started vacuuming her condo at 6:00 am, with a high powered and loud vacuum cleaner. Occasionally, she woke me up. Why she needed to aggressively vacuum her condo at 6 am every morning isn't something I can explain, except by the speculation that she suffered from Obsessive-compulsive disorder. Because I felt she was probably mentally ill, I never complained about it. I just bought some ear plugs.
