What a great thread.Thank you OP for starting it. I have a few icks...maybe too many, sorry this is long.
As other posters have said, a character "padded" to (for example) the kitchen, and it's always a female character! Impossible that she could walk, or go, she "pads".
Also women in books who always "slip on" a pair of jeans, or shorts, sometimes a (probably slip!) dress. I don't mean in an untidy clothes on floor plus highly-polished parquet combination of events, as in literally "slipped" on. Nope, that's just how she puts on her clothes. And if she's not slipping, she's tugging, ffs.
Unnecessary sexualisation of female characters really gives me the ick. A friend highly recommended Kathy Reichs' books as easy summer page-turners. There are loads of them, with a main character who's a pathologist / forensics expert (as is Reichs herself). So I gave one a go. Ick! Why the fuck does a highly-educated scientist author writing a murder mystery whose protagonist is another highly-educated scientist need to mention her heroine's "panties", that she slipped on, or off, alone, then (probably - I've tried to forget) "padded" to the refrigerator for wine? Why? Aaargh! Why are her "panties" relevant to the character or the plot? Oh, wait, now I see it. Presumably Reichs and her publisher were concerned the main character was too intelligent or academic or independent to be of interest to male readers, hence the "panties". Bleurgh.
Totally bonkers character names. Not in Harry Potter and similar, but in "serious" literature. One of my favourite authors, highly acclaimed, highly readable, can't seem to give anyone a name approaching ordinary. They're all named things like Ash Buccleugh, or Montmorency Caulk. Tbh though, I find it quite endearing now, so rather than an ick, each ludicrous name makes me smile, but with this particular author only. Cormoran Strike, as a bonkers character name: ick, because the books aren't as well-written, sorry.
Every single thing written by Sally Rooney gives me the ick, especially the one set in France with two student girls.on hols in a villa, one of whom is shagging the professor/lecturer. Maybe she's a Marmite author. I just don't think she's very good. By contrast, as a contemporary Irish author writing in English, Claire Keegan, for me, is sublime.