Ah yeah, Bernie is allowed to spend MONTHS calling Hillary Clinton corrupt, owned by Wall Street, etc. but the minute Clinton criticizes one of Sanders' policies suddenly she's NASTY and a LIAR. Come on dude. Sanders' has been running a "mean and nasty" campaign for months now.
Sanders has been railing against corruption and Wall Street influence. He implied that perhaps Clinton had a bit too much corporate influence, but little else. If you look over the past few months it was the news and the people saying that about Hillary, but not Bernie.