Who/What do you irrationally hate?

I'll start:

I fucking hate Coldplay. I have never seen the appeal to any of their music, as far as I'm concerned they're just a really boring U2.

Also, anyone who either steps in front of me on a sidewalk, or who passes me on a highway (whether they're going faster than me or not) I want to hit with a hammer.

What gets you irrationally angry, Reddit?