Because Sanders supporters gave us Trump the first time. If they simply did the adult thing and voted for Hillary, we wouldn't have this cretin in office right nowA lot wrong with this. For a start, why is it that ""the bots" are tearing Sanders opponents apart" as an especially bad thing when all the candidates are buying ads attacking each other (and Sanders in particular), when centrists on Twitter and everyones surrogates in the media are doing the same thing?
Secondly the whole cult argument is pretty absurd, as we saw over here where long standing Labour members (and people who returned to the party) were described as such because they happened to support Corbyn.
For a start it is a bit mad that people who adopt the same language (calling other people cultists), make the same criticisms (that their opponents don't have an interest in the party as a whole), who stereotype to a level that is way beyond acceptable and profess beliefs that are if not manifestly false then extremely questionable (that a centrist candidate exists that will beat Trump and that the Dem establishment will pick that candidate) get to go around calling other people cultists.