I’ve also heard of that Rabbi who mocked and said “l’chvoid my boich”.
I don’t believe that was ever anyone’s intention. As I understood
that story, it was meant to tell other people that they should not
think the Rebbe is on the level of doing things for the sake of
Shabbos and not the sake of his own gratification. (Or, in a sharper interpretation, to teach that just because one says
“l’kavod Shabbos” does not mean his motives are pure, and perhaps
a different declaration would be in order for honesty’s sake –
there is also a story of the Sfas Emes telling a grandson that
it is enough to think “l’kavod Shabbos” – it need not be spoken.)