To think this is rude?!

[Cornpoppin]

Went to siblings house (only been there a couple of times) and treat them well/host them when they come to mine... asked for a glass of water - get it yourself. They made themselves dinner and didn’t ask if I wanted any. Then asked me to wash my (single! Solitary!) water glass up before I left!!

You treat them as guests and they treat you like a sibling, is there much of an age gap?

Had they invited you or did you just turn up?

Were you invited? I'd get my own water at sibling's house so it's hard to see the issue unless they invited you for dinner then didn't give you food. Feels like there's a gap in the story.

Ah well, at least you know when you're not wanted!

Of course it’s rude

No age gap at all - I do understand the whole get your own water thing, but it’s a flat share and she keeps her water in the fridge... would just be nice if she was kinder about it!

Sorry, I am trying to understand this. Is it a sibling's house or is your sibling trans because you refer to him/her as 'them'. I am a bit confused

Do you live in a flat share? I think she’s acted like a sibling to be honest, maybe when she has her own place she’ll treat you more like a guest?

I don't think it's a trans thing some people, myself included, use "them" when referring to someone...

is it a siblings house or is your sibling trans surely whatever gender her sister is she would still be a sibling, it’s not a ‘sibling or trans’ type of thing and wtf has the siblings gender got to do with it anyway? Let me guess, if it’s a brother it’s fine, a sister and it’s rude?

You are not unreasonable. There is no excuse for that behavior. They sent you a clear message and I find it hard to believe they did not do it intentionally.

I think the key here is whether you were invited or whether you just turned up???