Peoples' animosity to friendly safety advice when climbing is amazing sometimes. Yes, people can come across as nosey assholes when they give out advice, and you have to demonstrate some tact. If you see someone in another party tied in incorrectly or something, it is unfortunate that you have to debate whether you should point it out to them or not, whether the tongue-lashing is worth it or if they will say "cool, thanks a lot for looking out for us". Being a bit of a recluse, I don't like talking to anyone while climbing, nevermind someone telling me what to do. But even if the advice is from some gaper loudmouth mazama I grit my teeth, smile, and say cheers mate, I'll keep it in mind.