My DP of 5 years brings his own cutlery and glass to my house because he doesn't like to share things. He had a glass on the bedside table in my room and it had been there for several days so I took it downstairs to wash it.
Unfortunately it is exactly the same as my glasses.
He is now refusing to use the glass because he doesn't know for sure that it is HIS glass. It is perfectly clean, I personally washed it and dried it with kitchen paper. There are no marks or smears on it.
I know he doesn't like sharing and I bite my tongue when he uses his own special cutlery from his own special pouch, but I find it offensive that he can't bring himself to use a clean glass because me or my children (teens & young adults) might have used it.
He manages to use glasses and and cutlery in restaurants/on holiday but takes a bottle of water every where we go so he doesn't have to accept drinks in other peoples houses.
He hasn't been diagnosed with any neurodiversity or mental health issues however I suspect there is something there which is why I bite my tongue usually.