I would argue that the axiom "consider the feelings of others" is pretty universal and timeless. Philosopher Simone de Beauvoir coined the imperative "do that which maximizes freedom for others" in 1947. Kant debuted his categorical imperative in 1785. These are not new ideas. You are acting like this is some arbitrary ethic which changes at random, when in reality the ideas of "don't be a dick" and "make society inclusive" is at minimum, centuries old.
At minimum, everyone always has the out of "I was wrong and now I understand." It is here that people like Seinfeld and Rowling really fuck it up.