The post that was quoted here has been removed

I insinuated no such thing.

(Twhitehead already called me a 'fool' about it)
No, I didn't. I said you were making a fool of yourself with all your silly attempts to get out of admitting that you were wrong about YouTube. It had nothing to do with your ability in mathematics which I have never commented on.

So Twhitehead's offensive personal attacks succeeded in baiting
me into responding by a minor demonstration as well as in words such as
'obvious' etc.
So basically posturing.