well the difference is that obsession with spongebob = manchild. obsession with futurama, south park, or whatever wouldn't really distinguish him from most people i work with.
in japanese class, we were talking with japanese students learning english to test our skills. this one girl we were chatting with said she was here to find an american husband because americans are much more handsome than japanese people. she said it so casually too, like it wasn't anything unusual to say. we just chuckled and moved on. 'cause americans don't really give a shit. (and before you get any ideas she wasn't really a looker.)