Are The Straights OK?

I've noticed this behaviour in older people a lot more than with my peers.

But to be fair, they grew up with parents from a generation where divorce was illegal, rape was excused an disabled people used as guinea pigs. They did not come from a great situation

Last week I bought my wife flowers, just as a nice thing for when she got off work on a Tuesday. Sat down on the bus and the lady across from me leans over and says: You shouldn't've bothered.
Three....THREE other ladies nodded and mmhmmm'd.

It really pissed me off that the assumption was that I'd fucked up and made her mad somehow and was trying to smooth it over with flowers.

My partner definitely does this a lot. We'll be having a good time and randomly she gets upset, usually because something in her environment reminds her of something she is/was unhappy about. Then starts bringing up unrelated things from the distant past that also make her upset, seemingly just to continue the cycle. This often just gets projected onto me and she gets extremely impatient with me or raises her voice, even if what she's mad about has nothing to do with me.

I thought this had more to do with her mental illnesses than anything. The fact that this is such a stereotype, though, makes me think we're failing our young girls by socializing them to be psychic vampires, similar to how we socialize young men to be aggressive.

Them: "Lemmy's not misogynistic!"

Also them:

This meme is a heartbreaking story about alcoholism

In the US it has stronger connotations of being really angry (not just annoyed, furious). "Pissy" or "feeling pissy" can mean annoyed. Pissed in the sense of being drunk isn't used much if at all. We also don't much use the phrase "taking the piss" to mean deceiving someone or joking around.

Ew, the CAMBRIDGE dictionary??? What are we, some received pronunciation "language shouldn't change" chuds??

OED or bust, bucko.

Angry?

When someone starts accusing their partner of cheating out of the blue, it can rather often mean they themselves have been cheating and are projecting their insecurity about it onto their non-cheating partner. I'm sorry you went through that, but it's great to hear you're in a better situation now.