To refuse to let my MIL bring her own kettle when she visits?

[BiscuitHammer]

Bit of a silly one maybe but it’s causing actual rows so here goes.

MIL is coming to stay for the weekend (joy) and she’s announced she’s bringing her own kettle because apparently ours “tastes funny”. I genuinely don’t know what that even means?? It’s just a normal Breville one from Argos. She says she can “taste the plastic” and it “ruins tea” which is ridiculous because we’ve had it over a year and no one else has ever complained.

I told her she’s being dramatic and she got in a strop. DH is now saying I should just let her bring it to keep the peace but I think it’s rude. Like sorry but turning up at someone’s house with your own appliances is a bit much isn’t it? What next, her own toaster? Portable shower?

I get she’s particular about tea (she only drinks loose leaf and swears PG Tips gives her headaches) but still. We’re not a bloody hotel.

AIBU to put my foot down and tell her to use ours or not bother?

(For context she also once brought her own pillow and sugar. Make of that what you will.)

I took the time to look it up. There is a difference that some people can taste.

Acrylic/Plastic
High (Often "chemical" or "plastic" taste)
Leaches compounds at high heat, porous, retains odors
Stainless Steel
Very Low (Neutral)
Non-reactive, durable, non-porous

So YABU if your MIL is one of those people with super-receptors! If she’s sensitive to the taste, why actively prevent her from enjoying a cuppa when she visits?

My DS is another - but his superpower is smell. He can tell if an electric bulb is about to blow, and once prevented a fire in the house because he could smell that something was smouldering, found it and neutralised it before it could spread. Don’t knock other people’s superpowers - they can be very useful!

Let her get on with it, as mad as it is, but tell her you'll be bringing a portaloo next time you visit hers. Offer no explanation for this. Just say something enigmatic like, 'well, that's for me to know' .