If I were to start a thread and start saying that VB.NET is stupid, some VB.NET developers would get offended but some C# programmers will find it witty.

If I were to start a thread and start saying that people living in New Jersey are bad and list out a bunch of reasons, some people will get offended, and some will find it humorous.

He's doing the same thing with religious beliefs. You won't find it witty because, as in the other cases, you are taking it personally since it's an attack upon a reflection of your beliefs? Part of the point he's demonstrating (unintentionally perhaps) is that while it's OK to insult someone else's baseball team, it should be OK to insult someone else's beliefs. I didn't mention football teams because I know that can get you stabbed here.