<human>: Can you summarize the given text in a few sentences?

Anyone with half a brain understands why we have stopped using offensive terms that insult a whole group of people.  It's no longer "cool" to call people the N-word, though many assholes still do.  It's no longer cool to call people "fag" or say something's "gay", although many jerks still do.  But for some reason, everyone can still get away with calling other people "retard" and making the Carlos Mencia noises.  Why is that?  Is it because there's little to no danger of someone affected by the actual condition being around to hear it?  And even if they were there, they wouldn't kick your ass or yell at you or make you feel bad like people from the other groups?

When is the world going to grow up and realize that say "retard" doesn't make you cool?  They have a problem, what's your excuse?
<bot>: Don't say "retard", it's just as bad as all the other no-no words, and it makes you a giant asshole.