As with most of his other stuff, there's a lot of truth to this:
This is a massive problem that the left needs to address. Western democracies are crying out for political upheavals because thirty years of neoliberalism and globalisation have failed so many communities and left them behind. The divide and rule rhetoric of the far right is succeeding because it is providing disenfranchised people with a means to explain their grievances. Rather than multinational corporations refusing to pay their taxes and bankers recklessly gambling with people's money, it's benefit scrounger Chantelle with her twelve kids down the street that's to blame for the drain on the economy. Rather than a lack of investment in the creation of secure jobs, it's the underpaid and exploited Polish immigrants who are taking your jobs. Rather than the government building more housing, it's Sanjeep and his Muslim buddies who are to blame for you not having somewhere to live. This nasty, divisive and false discourse that absolves the elites of any responsibility is working and will continue to until the left pick themselves up and put together a coherent alternative which resonates with these people and addresses their very real concerns with the actual answers.
Brushing off hundreds of thousands of disenfranchised people as 'racist' and 'sexist' (even though these will account for some of the Trump and Brexit voters) is reductionist nonsense that only seeks to push people away further. You don't win a debate by shutting people down. The bottom line of all this is that the Democrats picked the wrong candidate in a political climate that was quite clearly tired of establishment dynasties that represent more of the same.
All that said, there's also a lot of truth to some of the points raised in this thread. 'PC gone mad!!!!' is often translated as 'wah wah wah my outdated opinion isn't considered acceptable anymore, why won't people agree with me

'. As others have said, freedom of speech (much like democracy) works two ways. You are entitled to say what you like, but others are free to criticise what you said. Freedom of speech is not equal to 'freedom to say what I like and no one can challenge me'.
Finally, it's also worth pointing out for the umpteenth time that Hillary ****ing Clinton of all people does not represent 'the left', nor does any genuine lefty support 'corporate takeovers' or illegal wars. Such depictions are completely misguided.