This is terrible. Sanders was actually running a sympathetic campaign until march 15th. That was the turning point where his campaign could pick one of two options: campaigning on the issues while realizing that Clinton was the presumptive nominee and thus avoiding actively hurting her for the general OR going scorched earth on Clinton in a desperate attempt to pull off some mathematical miracle. Unfortunately they picked the latter and have real trouble deviating from that plan as his chances become ever more improbable.
Come on, this was already quite blown out of proportion before your comment.