I would say the only things that are total pet hates are:
-Carpets in bathrooms/kitchens
-Coloured bathroom suites
-Artex on walls
Aside from that, I wouldn't say there's anything that I hate - things I wouldn't choose, sure, but hate it such a strong word! I don't like Cath Kidston, but I don't hate it!!
You would hate my taste, incidentally - I love grey with other colours, have lots of photos on my walls (mainly of my nephews and niece), enjoy having a framed quote/phrase as part of my decor (but framed and something I've chosen/created myself, rather than bought from the shop), and have laminate flooring in the lounge/diner of my house (because I can't afford real wood). I like having a 'feature wall', although it would be a paint, not wallpaper, situation.
Basically, I like what I like and therefore my decorating taste is a mish-mash of things that appeal. Also - as I hope everyone else on this thread does - I give zero shits what others think about it. 
I do quite like that seagull on stilts though, and definitely did not see him when I lived by the coast, or he would probably have a home with me now.