From The Vault of Buncheness:
Yes, this actually ran nationwide in 1970, which beggars the question of just how out of touch creator Hank Ketcham was. Were the 1960’s something that didn’t happen for him? Whatever the case, the Cleveland Press printed this apology the day after the strip ran, printing it in place of what would have been that day’s DENNIS THE MENACE installment:
Yesterday’s DENNIS THE MENACE cartoon offended a number of Press readers. The Press apologizes for the affront caused by the cartoonist. It assures subscribers that such a thing will not happen again.