INFPs seem...softer to me. Lacking the cynical edge that us INTPs seem to have.
They're more fuzzy and huggable.

And I usually kick myself if I'm as harsh to them as I would be with an INTP. I don't mind telling an INTP to "stop your bitching", but I'd be more hesitant about such with an F.
Sorry about the slapping last night, kitty.