AIBU to snap after my mum kept calling a bike a trike?

No no no! Evil bastard things! I smashed my face falling off a scooter when I was OP's daughter's age (albeit I was trying to do an Evil Kneivel jump off a ramp so not entirely the scooter's fault) 🤕

OP this is the kind of shite my dad used to pull, any excuse to wind me up. When I'd inevitably blow my fuse he'd be all "FGS can't you take a joke?" Tedious as hell.

It doesn't sound like manipulation to me. The OP shouted and swore at her DM. That's what the apology is for.
I know my DH isn't being rude on purpose he's just dozy 😃

I imagine it probably wasn’t part of a larger pattern of behaviour then, as appears to be the case with the OP?

My mum called CDs ‘tapes’ for about 30 years but at no point did I a) believe she was doing it on purpose or b) start screaming and shouting at her about it.

That's not really indicative of any neurodivergence except autism, as far as I'm aware.

or a pony 🐎🐴

Have you considered a scooter? 🛴 🛴

Think you’ve hit the nail on the head tbh OP

People who haven’t experienced anything like it won’t get it!

🤣🤣🤣🤣🤣

🤣🤣🤣🤣🤣🤣🤣🤣🤣

I think this too!

And it has such deniability- “why would that be annoying?”

Are you the lot who have just been on holiday together?
😂😂

It’s actually really funny 🤣🤣🤣

This makes no sense.

You are saying that the OP should apologise to her manipulative mother because your husband can't be bothered to use language accurately and doesn't have enough respect for others to call them by their own names.

What kind of logic is that?

I don't think anyone who hasn't experienced a person who purposely and repeatedly mispronounces things can understand how infuriating it is.

My MIL is terrible for it and it will be stupid words like instead of saying electric she will say yectric. Praise the lord I'm NC with her so I don't have to hear it anymore.

You wouldn't last five minutes in this house - my DH calls us all by the wrong name, says cardigan for a jumper, calls sunscreen sun tan lotion, every hedge is a privet 😃 I find it mildly annoying at times but I know what he means. He's a very intelligent bloke and absolutely does not have dementia. It's just stuck in his head and he can't be bothered to call things by their proper name.
You should apologise to your DM

You are a mum yourself now. Stop behaving like a child, just laugh and diffuse the situation.

It will impact your dd much more to see you taking it so irrationally seriously and letting it get to you.

I totally and genuinely believe you.

However, the OP's sister already heard "trike" and thought "tricycle", so the evidence points to OP's mother having been clear on the different names for small two wheeled bikes and for children's tricycles when she was bringing up her own children. If they'd grown up hearing their mother call small bikes "trikes", the OP's sister wouldn't have told the OP that five years old was too old for a child's tricycle!

My mil used to call my kids twats instead of twits.( not that she'd say it often) don't think she knew the difference! Hahahaha
Only a mother can eind u up like that!

But some people just do that. My mother pauses lengthily before she says a name she considers ‘foreign’ or ‘pretentious’, even if it’s in no way difficult to pronounce and she’s known the person for years. I know someone who makes a ‘listen to me being French’ face and sort of screws up her nose to say ‘croissant’ which she pronounces ‘QuossANT’ to rhyme with ‘boss ant’. My MIL consistently mispronounces her half-Guatemalan grand daughter’s name, because she think she should have been given a name from the other half of her heritage.

Maddening*, but not wildly uncommon.

This isn’t about the OP’s mother accidentally using the wrong word. Anyone who thinks that is very lucky that they haven’t got a mother/parent like this.

Yabu to go off on her but I would of potentially done the same and then felt guilty afterwards Its just so irritating

True - although some people on MN will still refer to their children as toddlers long after they realistically are. They don't stop and think about what the word actually means - they just use it generically to mean a very young, dependent child.

Then again, when I was young, I attended what was officially called 'infant school' - even though nobody ever uses that word outside of a school context to refer to a school-age child. Technically, the word means 'unable to speak' - yet I and every single one of my schoolmates could speak very fluently by that age.

Can you wind her up back when she does it? If she deliberately gets something wrong tell her she should see the GP for dementia, or whatever combination of words will wind her up the most. Use the exact same words every time.

I think people who think OP is annoyed because her mum accidentally uses the wrong word are not understanding the situation