I have many but I will list thirty four.
1) Somebody asks a question on social media to the general public.
Somebody responds: "I don't know".
Then the question wasn't for you, Jane. Move along.
2) Not recycling. I can't stand it when I see plastic bottles in the garbage can or in the dumpster.
3) The use of 'lol', particularly as punctuation at the end of every sentence.
4) Restaurants being advertised online as having vegan options when all they have is a garden salad and french fries.
5) Labeling of vegans as "militant" without defining and expounding on the use of that term.
6) Boomers who leave Amazon reviews praising the easy transaction process and shipping speed, but say nothing about the actual item. Nobody's reading your review to decide if this newfangled 'online shopping' thing is worth taking a chance on.
7) When people tell me hiring more women is improving their institution's "diversity".
It's called equality.
You can't tokenize something that is more than half the population.
8) This is a personal pet peeve: Capitalism and socialism are modern socioeconomic systems with loads of historical context. If you redefine everything bad that has ever happened to anyone in history as the fault of a system created in last 300 years, you're just wrong.
9) A huge pet peeve of mine is when people use the term 'late capitalism' instead of just capitalism when critiquing it, because it leaves open the implication that early capitalism was comparatively fine when it really wasn't.
10) The phrase: "Do your research".
Research is a process of rigid, verification, peer review, never ending scrutiny, and the moral rectitude of accepting being wrong. A Google or Youtube search has never been and will never be "research".
Don't trivialize hard work.
11) AI researchers calling their bad research "more HCI than AI". No, I wouldn't call that HCI research either.
12) Common sense disguised as news. UNC research: "People who bike or walk to work are more fit, less fat than drivers".
13) Starting a question with "has anyone else...?" in a large fb group.
Like, in a group of 55,000 bibliophiles, I am willing to bet you're not the only one who has read this widely popular book.
14) When people say "a YA" or "a middle grade" and don't follow it with "novel" or "book" or some actual noun.
15) People who comment knowledgeably, snarkily, and definitively about a movie they have not seen. The same people would never do so about a novel, a play, a painting, architecture, or any other artistic work.
16) Food bloggers who write an entire novel before their ingredient and instruction lists.
Let's skip the long talk and get straight to the good stuff, capiche?
17) When a book is titled "[title of book]: a novel".
18) Conservatives calling prefixing Elizabeth Warren with "Professor" as if it's a nasty epithet.
19) Professors taking extremely simple algorithms and obscuring them in convoluted (and generally mutable) representations.
20) When news/tweet uses "Harvard study". Appeal to authority is a dangerous fallacy. Science should be judged on it's own merits.
21) Academic and medical papers that use Harvard commas in one part of the paper and not use it in another part. Be consistent, people!
(Yes, this is a total academic snob type of pet peeve).
22) When people write "Harvard professor" or "Oxford professor" before naming someone. It reeks of snobbery and appeal to authority.
23) People who try to measure "how hard it is to get into Harvard" by looking at acceptances over applications. By that measure, Oxford and Cambridge are the easiest universities to get into in the UK.
24) People who think "liberal" is a relevant, meaningful criticism of an academic.
25) Long-standing pet peeve: Insults disguised as "constructive criticism".
26) I am getting very tired of authors using the phrase "we know surprisingly little" on a topic. Even when that's true (and not just a result of authorial ignorance of the literature), can we find another phrase, people?
27) When the cover of a book adapted into film is the poster from said film. You're ruining classic literature, Jake.
28) Shrink-wrapped books at the bookstore. They might as well say, "We don't really want you to buy this".
29) A bookstore/coffee shop without a decent number of outlets for laptops; it seems to snap, "buy a book and leave, mate".
30) When girls flaunt nudity or excess skin just to get followers on social networks.
31) Flagrant nudity in the gym locker room. Can we keep nakedness to the amount required for function, please?
32) When a post is specifically about/for lesbians and non-lesbians either go "I am not a lesbian but" or says it's universal.
33) People who think they are owed a proper scholarly debate no matter what their argument is.
34) Anyone whose default response to a debate challenge is "But I have a degree in X".