Technology and busyness have created a culture of anonymity, but preaching is a personal endeavor for the preacher the congregation, which operates within culture.
It is inevitable in a lifetime of preaching that we shall all make mistakes in our preaching. Sometimes these mistakes become embarrassingly more than we intended. I, too, have flubbed by saying something so ineptly stupid that there was no way to call it back nor somehow unsay or explain it. My own have been very gross, and I can hardly bear to think of them; so I will use only the pulpit bloopers of others to make my point.