Asking about 80's computers and knowing about 80's computers are two different things. I've read the original post 4 times. There is nothing objectively wrong with my reply. I will agree there are perhaps valid alternative interpretations, but that's no reason to complain about my interpretation in such a rude way. If someone by chance interprets it different, they can give a re-phrasing of it based on how they interpret it. No reason to rudely accuse the other person of reading it wrong.