Totally inconsequential as it relates to a long-ago ex, but it came to mind this evening.
I think I am (or rather was) quite likely U, but this used to really wind me up.
In order to clean his glasses he would first wind about a dozen sheets of toilet paper around his hand. He would use roughly half of one sheet to (ineffectively) clean the glasses. He would then throw the toilet paper away (wasteful as it was still basically clean). He would then flush the toilet (wasteful and unnecessary). Finally he would not wash his hands after flushing.
Would that annoy anyone else?