First of all, I didn't ask for anyone to be banned.
Second, I will admit that calling Trumpers names is childish. Even though they've done PLENTY to earn the vitriol.
But the word "retard" and its derivatives are widely considered a slur and are deeply offensive, particularly to people with intellectual disabilities, and while I'm sure that Chimps would also be deeply offended, it's not quite the same. But I'm sure you know this.