> It doesn't make those beliefs rational.

Humans are irrational. This shouldn't be news to anyone who is a human. I think it is reasonable to say that literally every single non-infant human in existence has done at least one irrational thing in their lifetimes, including you and me. Certainly there are humans who do more or fewer irrational things than others, but that doesn't matter all that much.

> I think your point might be that, because there are people with irrational beliefs out there we must appease them?

Sometimes, yes. Often, I'd say. People's feelings actually do matter. Sometimes the level of irrationality can be high enough that one might not care too much about hurting someone else's feelings in calling our or ignoring that irrationality. But very very often, we humans take into account others' irrationality when dealing with them, in order to make interactions more pleasant for both parties.

(Anyway, I don't disagree with the sidetracked point: that it's not absurd for a sequence of phones or characters might cause offense. It seems disingenuous to deny the reality of "bad words". I do think that this side discussion on irrationality and how to deal with it is potentially interesting, though.)