A lot of people just don't find BBT funny, which is a reasonable opinion to have, but they both manage to poke fun at their respective sub-cultures.
The IT crowd subculture is generic "IT support." The subculture of BBT is the pseudo-intellectual crowd who took biology 101 and are now experts in everything "science."
As I said, I would never begrudge anyone who doesn't find BBT funny (it rarely is!) but let's not pretend that IT crowd is somehow magically different, it is just better written.