The resolution was an outrageous condemnation of the freely chosen economic actions of millions of Americans.
Worse, that condemnation was made on the express behalf of not just a foreign government but the specific policies of one foreign political party (Israel's Likud Party and its leader, Israeli prime minister Benjamin Netanyahu). Its intended purpose is to give Likud and Netanyahu the advantage of perceived US support in Israel's upcoming election.
Worst of all, the resolution's proponents made – and now that it's passed, will continue to make – extensive use of overt, undisguised race-baiting, posturing as defenders of Jews while smearing their opponents as anti-Semites.
What are the purposes of the BDS movement?