Loathe as I am to defend Clinton, she wasn't dismissing the "basket of deplorables" because of their skin colour or socio-economic status. She was dismissing bigotry generally as deplorable, and it's generally overlooked that Trump has a huge base among wealthy people too (tax "reform" is one area I anticipate he'll have a lot less difficulty getting through than healthcare, the stupid wall etc.)
It's a general point, and paralleling some of my recent comments, but wealthy bigots do seem to get away with an awful lot, perhaps there is snobbery mixed up in that from liberals, but far less scrutinised is the way the dynamic is used by elitist reactionaries: "how very dare you, calling poor people all those rude names because they are poor" when in fact the problem is the bigotry and not the class. Of course elite bigots will want to distract poorer bigots and throw out red herrings, but that's no reason why people should get sucked in by the act too much. That said, fascism has always exploited such dupery and it's very appealing to bourgeois bigots as well. Yet, the strongest forces of anti-fascism are probably to be found in the working class too. That needs to be supressed by the elite, who will deliberately seek to conflate liberalism with being anti-working class for obvious reasons (despite the problems with liberalism, reactionaries are an even bigger up-front menace). Anti-intellectualism is also wound up in this, a cornerstone of tyranny generally and recent generations have seen a depressing slide in emphasis on working class political and cultural education (look at decimation of Adult Ed, libraries as manifestations of this, as well as cultural trends), it's all very much "know your place, don't trust clever people - they're not like you. Trust us instead. And they're liberals / lefties, ergo liberals and lefties are bad so join our reactionary crusade and lap it up. Unite in bigotry and forget all that class stuff". Tories are full of this shit, Trump is the same thing on steroids. But there is push back too, and appetite for it, hence relative success of Corbyn (middle class tho) and Sanders (probably ditto all told)