I hate it when people expect that you read your emails every minute. I can't count the amount of times that I had a meeting with someone that they scheduled on the same day while I am sitting in a lecture(it's extremely rude to not pay attention to the lecturer, come on). Needless to say. I would notice the emails way too late and miss the meetings, because they expect you to be available at a minute's notice as well.

I sent way too many apology emails this year, honestly...