I think Stadler's advice on these matters is the way to go (and the way I always try to go). If someone is doing/saying/tweeting the things that DS, or for another example, the tweeter in chief, does/says/tweets, there's no need to resort to name calling. They're sadly giving you plenty of legitimate things to take them to task for.
(And I don't know what the language rules here are, but if you ask me, that particular word shouldn't be used when referring to anyone - member or ex-member of DT or not).