I think one of the most annoying things is when a person doesn't prioritize. Like I know we all do it at one time or another, but when it's so bad that the person is suffering for the consequences it's just so irritating. Especially when they complain about it. Like not having enough money to afford an quality item, but they spend the equivalent if not more on very cheap items that tear up in no time and say "I'm saving money," and then when you advise them on where to get an better quality item, they're quick to say "It's too expensive," or "we don't have the money,"
but they'll spend it on frivolous things. I'm like you have more money than me, but always broke. C'mon now.
*Sigh*