DS (age 11) hates seeing DD (age 8) biting her nails. He gets really really would up by it and is constantly telling her not to bite her nails and can get completely distracted and distressed when he sees her do it! It is a bad habit of DD but, although I do gently discourage DD from doing it, I also don’t think it does anyone else any harm and she is otherwise happy. I’ve tried to explain this to DS but he continues to tell her not to do it as he says it’s disgusting and spreads germs! He says it harms his eyes to watch DD do it!! DD is now getting really wound up by DS (although at times I’m sure she’s doing it on purpose to wind up DS-normal sibling behaviour I suppose!). I then get annoyed at DS getting annoyed at DD and it feels like a viscous circle!!
AIBU to get annoyed at DS re his behaviour towards DD? Anyone had similar situation and how did you resolve?