43 Folders' Merlin Mann quoted Jeff Biggler who said:
This is so true and I consider myself to be a nerd here! Enough said ;-)
All people have a “tact filter”, ... “normal people” have the tact filter positioned to apply tact in the outgoing direction. ... “Nerds,” have their tact filter positioned to apply tact in the incoming direction.
Normal people need to understand, that nerds are usually tactless, things they say are almost never meant personally and shouldn't be taken that way.