Hmmm...
I can't think of much, because I'm a pretty calm and happy person most of the time.
But there are a few things.

People who go door-to-door for some awful reason, such as selling a product or service.

People who ask to bum a cigarette from me. (I don't smoke, you haven't seen me smoke, so why are you asking?)

When I'm continuously interrupted and I feel unheard. (I will leave the conversation in a heartbeat)

When drivers weave through traffic, cutting off anybody and everybody. (This makes me not only uncomfortable, but you have to understand you'll likely get stuck at the same red light anyway!)

When drivers intentionally block you from getting into a lane. (I will not hesitate to go sooooo slow, you won't want to play your dumb game anymore)

People who try to sell/market my artwork. (I've caught people before. Yes, I'm flattered, but just because you've no artistic ability does not mean you can take others' work, monetize it, and sell it for your profits without an agreement prior to production)

People who look at or use my personal belongings without asking (grabbing and reading my books, taking my controller to use, looking at my personal notes, any of that. That's a huuuuge NO in my book)

Impatient customers on my Etsy. :) (I send my orders in large batches, many of which are custom-made. I quote that it may take up to 14 days before an order is sent out. That's a long time, yes! But I'm not making a trip to the post office for every individual order, I'm sure that's reasonable.)

People who openly berate me.

When I lose things (my own fault, I'm very scatter-brained and I have ADD pretty bad. I have done everything to help it, but it's just a curse that follows me everywhere.)

Turns out that's a lot of things! Who would have known?? ^~^;;