People often don't realize how insanely annoying they are to others.
The emerging standard in open plan offices is "wear headphones, idiot, it's noisy", with anything short of shouting being dismissed as your problem. Makes sense to me. You can't expect to constrain everyone around you.
What really pisses me off is the lack of dignity (and privacy is a big part of dignity). The older you get (and the more oddball health issues you accumulate), the more this matters - to everyone around, not just you. I'd prefer to know much less than I do about my co-worker's colostomy bag, for example. Thanks, management.