@CheerfulYank, I'm genuinely puzzled... of course I alphabetise my books. Otherwise they would be in the wrong order, and that would be All Wrong.
But then, I nodded along up thread when @nina2b said "I also have a new rule that we are only allowed to buy books of seven inches or less until the narrow shelf over the window is completely full then normal book buying can resume." because we have rules like that in our house at certain times.
The only decor thing I can't stand is ornamental verbs, inspirational stickers, and sentimental cross stitch. Not awfully keen on family portraits
where the background is white and everyone is in matching jeans, white t-shirts and bare feet, but DH has a family portrait just like that which he thinks is lovely (and all his siblings have a copy lovingly displayed in their living rooms), so we've had to agree to disagree and hide it in the spare room.
I also have a friend whose entire living room is bedecked in Union Jacks - cushions, rug, little flags on the fireplace etc. I find it a bit much.
Other than that, there are things that aren't to my taste, but nothing else I really loathe.