There was a thread a while back about stupid counsel that was given by elders, but I didn't think of this one while it was active.
I was a teenager back in the late 1960's and early 1970's. At that time, it was rather common to use the term "bug" to mean "annoy" or "bother"; i.e. "You're really bugging me." (I guess such usage of the term has not yet faded away completely) Anyway, I recall using that expression once in the presence of an elder who promptly counseled me that that expression was not to be used by Christians, since it derived from the term, "buggery." So if I said that someone was "bugging" me, that meant that they were having anal sex with me (presumably against my will). In retrospect, I think I would have found that to be much more than "annoying" or "bothersome."
When this memory popped into my head the other day, it seemed obvious to me (why I had never thought it through before, I have no idea) that the expression must have originated with the idea of an insect flitting around one's head, causing an annoyance, i.e., "bugging" the person. It certainly makes a lot more sense to me than the elder's theory.
Which led immediately to another thought: Where the heck was that elder's mind, anyway?