the difference between divrei torah & vhasidus is that chasidus is messages of mussar in going on the right path of righteousness towards hashem while a dvar torah is just a nice saying from a gadol on the parsha or yom tov etc…
the chapping at a rebbes tisch turns it into a chillul hashem when those that come for chizzuk see the manners of these chassidim. it also turns the rebbe & his food making it look like avoda zara to eat a peice of his shirayim