I'm not going to ***** about the music I loathe, mainly because my taste in music is both eclectic and sometimes very cringe worthy. Plus I don't generally listen to the radio so I usually don't have to care.
However, spiky hair, I thought it was stupid when I was 11 and some 20-odd years later my opinion hasn't changed, but whatever. Rat's tails & mullets (especially when the rest your hair is ultra short), these were barely cool twenty years ago and now you just look like a crim (or future crim for the under 10's). Stoners, omfg, get a job you lazy fuck and if you have one I can accept your habit if you only smoke lightly and you accept that prolonged and/or heavy use is not nearly as safe as you think it is.
The under 16 girls who dress really sexy... what the fuck? And tweens who do it, what the hell are your parents thinking???? I can accept 14/15 year olds may want to experiment with risker clothing than they have worn in the past and thats ok to a point, but keep it tasteful and age appropriate. Parents, it's your job to say no occasionally.
With the exception of Crocs and chicks who wear uncomfortable shoes and then especially when they complain - all it says is your too dumb to wear comfy shoes, footwear otherwise doesn't tend to bother me.
Personality wise; people who swear loudly/ offensively in public for no real reason, people who haven't worked out the secret to getting good customer service is to be polite, panhandlers (except for the guy who approached my friend and I during the day, kept his distance, was polite & straight out said he wanted the money for booze). There's so much, so little time.
My big one is gamer's (and anyone really) with poor personal hygiene, your skin condition or whatever isn't an excuse, it's a reason to spend more time/ effort washing not less.
Also, me bitching about my life when I'm the one to blame and/or the one who can do something about it.