worst ones, ranked:

Groups of people who walk really slow and take up the whole width of the hallway so you have to walk slow behind them.

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People who have to "one-up" everyone - their story or tragedy, etc is bigger than everyone else's.
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People who stand too close behind you in a line (supermarket, ticket line, etc).

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People who wear too much perfume/cologne to work.



Everything else I can usually deal with. The perfume/cologne one wouldn't be bad if it was good perfume/cologne. It's never good perfume/cologne

My metric for these are "would I rather listen to someone crinkling a plastic bag for one minute" and the plastic bag is almost always worse