Here's a good definition of the word irritating: someone who hears a slightly-risque (and only kind-of-funny) joke, and then has to go and repeat that joke to everyone he meets. And I mean everyone -- strangers, family, waitresses, bank tellers, and store clerks. It's a ribald joke that might be well-received in a bar after a few beers when one is among friends. Told to a complete stranger (especially a female), it could lead to charges of sexual harassment.
How can someone be so socially tone-deaf?
There oughtta be a law, I tells ya.