One of the more frustrating things about trying to be a nice person is the amount of weird stuff you have to completely ignore. And if I could develop a program to help people increase their self-awareness, I'd be a rich man. Because while it might be funny on The Office for Michael to push the barriers of awkwardness and ignorance, it's not as funny in real life.
One of my older brothers thinks it's normal to clip his fingernails at any time… and in any place… in the presence of anyone. He actually carries nail clippers with him and isn't shy about pulling them out during dinners, meetings, or even weddings (yes, weddings). I understand that a person should be well-groomed. But I would much rather see a semi-unacceptable fingernail length than hear that clicking noise over a bride's vows. Especially when I'm sitting right next to him while he does it.
Another one of my older brothers doesn't seem to understand proper phone etiquette. He calls from elevators and concerts, he hangs up on me without any signal that the conversation is ending, and he puts me on speakerphone while brushing his teeth. Utter ridiculousness. But there's a new leader atop the list of infuriating phone etiquette breaches: eating fruit while on the phone. I know he's not messing with me, because he's totally oblivious to anything he does that might annoy other people. So somehow in his brain, it makes sense to chomp on a pear while he tries to tell me about the weather. It's like listening to Hooch drink from a bucket of pudding while a concussed person speaks in the background. And that's usually when I pretend I'm in an elevator and I "lose service" long enough for him to finish what is apparently an amazing pear.
(And in case you don't know who Hooch is, he's the one in the picture below that's not Tom Hanks. Now imagine him drinking from a bucket of pudding. Now you know what I hear in Example #2.)