Strange and Unexpected Impressions While Traveling Abroad

I was shocked, and at the same time, entertained, to see the signs on the walls in various public places like the airports, stations, hospitals, etc indicating “We do not tolerate racial or verbal abuse. Please respect our staff members…” or anything with similar messages.

Do they really have to make a sign to remind the public of it?
Isn’t it an elementary-school-level common sense that you should not be a fcking cnt like that?