Look, this isn't a dissertation, it's a casual conversation, okay? I don't come to a casual conversation prepared to make detailed citations. If you're so curious, I'm sure you're capable of using Google on your own.
I'm a little taken aback by your defensive answer.
It's casual conversation, but you're throwing a lot of "facts" around in this "casual conversation" and as part of the "casual conversation" I was curious where you got your information.
I don't think that's unreasonable and thought it was an organic part of the conversation.
Further, I haven't been in this board long, but notice you're prone to picking apart a person's post and dissecting things into quotes and addressing every one of those points. So is it "casual conversation" or is it something further when you decide it is? You preach one thing, but you also seem to be practicing another.
Anyway, it's not that big a deal. But there's no need to be rude about it.