Rudy,
I agree with you that Fabian Pascal could have used gentler phrasing.

In other words, he was highly opinionated. But rude? No. Arrogant? Yes. Condescending? Maybe.
I can tolerate arrogance from those who have something to be arrogant about. Like JohnMcEnroe, Michael Jordan, etc. (Not that they were arrogant.) But the truly great people are those who are acknowledged masters, and humble at the same time. Like Chris Date.
In this particular case, I disagree with Fabian Pascal. There are quite a few interesting things that Joe Celko says. Does he make mistakes from time to time? Yes. But then, I do not have to agree with Celko or Pascal on every single topic.
There is a saying in India to the effect that: The Lotus is a beautiful flower despite growing in very dirty water. Ignore the place that it grows in and appreciate its beauty.
I apply that to the debunk site and ignore the arrogance that sometimes comes across. My aim is to learn new things, and that site does do that for me.
Ravi