The constant sports on TVs in bars and the noise the patrons make. Whatever happened to background music?
To be fair, most of the bars I see around here are what you'd call sports bars, where the whole pull is you can go watch the game and have someone else serve you drinks all night, but not have to pay $XXX+ for a ticket to the actual game. I don't like them, as I don't like sports or loud bars, but that could be the reasoning.
Strangers who start conversations, though, I despise. I was waiting for my mom and grandma at the airport last night. Someone asked me if I was waiting for the flight from OtherCity, and I said yes. Then he commented on my book (Sherlock Holmes, for the curious). This was a priest, and due to my upbringing, I couldn't stand the possibility of ignoring him. Yes, it was a nice conversation, but I would have rather just read my book without talking to someone.