I usually recognize my own faults —- after a while.

From a sports officiating perspective, I suspect it would earn an immediate unsportsmanlike conduct penalty on any field or court this side of the Pond (in tennis it would fall under “references to reproductive or excretory functioning” which is a nearly-automatic code violation), whereas “twit” or “twerp” (along with oaths like “hell” and “damn” would get a lot more leeway.

For a reverse sort of case (a historically non-obscene phrase that younger people cannot imagine as anything but obscene), look up Sen. Orrin Hatch’s use of “shot their wad” in the US Senate. Here is one of the few stories about it that is not asininely smug (in the way that self-proclaimed "cool people" specialize in being):
http://www.slate.com/blogs/browbeat/2017...r_wad.html
One of the key facts (and relevant here) is contained in the rather artful last sentence (while the equivocal phrase "One imagines..." is almost surely superfluous with respect to Sen. Hatch, starting the sentence with that old-fashioned construction is a nice touch).