When I was a kid I got in a fight with another kid because he said something and I said the opposite. He decided I was calling him a liar and nothing I said would convince him otherwise. I really didn't think he was a liar. I just disagreed with what he said. Because of his determined misunderstanding I had to beat the poor guy up. Well, at least that's my story and since I haven't seen him for probably 65 years I'm sticking to it.
Saying an idea is foolish isn't quite the same thing as saying the person who suggested it is foolish. It seems foolish to get upset about that.
I find that this is a pretty friendly forum but it's one in which people speak their mind and aren't always extra careful about how they do it, which I think is as it should be. It makes it a lot easier to express ourselves. If we have to go through everything with a fine tooth comb to get rid of anything that might possibly offend someone we'd not only be a lot less expressive, we might even be accused of being (shudder) politically correct.
Barry