My pet peeves:
Designs that are not printed straight on the fabric
People that assume the way they were taught is the ONLY way to do something. For example, I never saw a seam ripper until I was 13. I tear up more stuff with a seam ripper than I do using scissors to pick stuff apart.
And....this one is dumb, but.....yellow fabric. I hate the color yellow for the most part. There are a few exceptions but I am stewing over this because I signed up for a BOM at the LQS and it has more yellow than I think I can handle. I know....I am crazy. But, it is okay. The people in my little world know me and accept me. LOL