Just nonsense. Hillary won the working class, just not the white working class in specific areas of the country. Sadly, you are just reflecting the popular media myth effectuated by the NYTimes continuing white Trump voter who-they-are type coverage. She won the Latino and African American working class and a decent portion of the white working class too. And, arguably, her campaign was all about inclusion, a message that a lot of pollsters actually think hurt her since it's clear Trump's nativism is what sold him in white rural areas. In essence, race was a big factor in her loss, whether you want to accept it or not. White people responded to the they-are-taking-our-stuff message of DJT.
More to the point, what's clear is the biggest swing in the election happened after the Comey letter. This is unequivocal in the polling. This is not to say she was an awesome candidate, but they are two points that have to be acknowledged.