well first off id like to know what you said to them, was it like "your a fat bitch and need to die of aids" or did you just say something like "your hair is fuzzy...haha" and drive off

depending on the level of severity it can be serious and stupid...
some people just dont joke that way

ill tell you a story....

not that long ago (about a month and a half) i was on the "rich" side of town... and i drive a old shitty car (a 1983 ford crown vic station wagon) and i was going to a friends work (stien mart) and these two young rich assholes pulled up to me in a new tahoe and yelled "youre a bitch, take that POS back to the junk yard" and sped off..... well those jerks didnt know that my POS has a 302cu.in. with a custom holley 4bbl and dual cherry bombs under it (nor did they know i carry a 32cal. under the seat).... so i chased the little fuckers into a wal-mart super center and both hopped out..... well when this happened in got out with mr.32 and gunned these fuckers down......their attiude changed real quick (they were in moms tahoe going to a football practice, they had their team uniform on).... they were like "im sorry, im sorry please dont hurt us" and bitched up like little girls and i told them that some people dont play and the next fucker might kill those little assholes.....

well they shut up and left...... fucking pissed me off

so yes id say very immature...... think twice next time