Just day to day stuff, that has always irked me:
My hair. I like it long-ish and neat looking . The elements are determined to drag me through a hedge backwards on some days.
Hair bobbles. I just think, oh, my daughter has had them all. Or I can only find ones in Frozen colours. Brilliant.
Being belittled.  In my last job, If I was out my office doing something - I'd sometimes get a client who would say "Oh I'm looking for Atom - I think their your boss".  Now, I'd either shoot them down there and then, or go "Oh come this way, have a seat. Then sit down behind my desk and say "Hi, I'm Atom, Operations Manager..." and extend my hand.  The looks were priceless.
The whole celeb-zamg magazines/news some of my friends / lots of ladies like.  "Did you see Beywest-Lo's rear in that dress this morning?"  No. I had a light work out on my punch bag before my daugther runs in ready to cause hell another day.