Detractors will say that this proves that all the people who voted for Trump are dummies. They will alternate between mocking the stupidity of the Trump voter and wondering how long it will take before that moron sees the light, if ever. They will enjoy this. And so on.
That's all good as far as it goes. As Jonathan Haidt has pointed out people on the progressive side of the spectrum tend to value the moral concerns centered around "care" and " fairness" very highly, even occasionally to the exclusion of all else.
And Trump's plan does batter those classic liberal concerns quite a bit. If you work for someone else and/or make less than say $300K a year Trump's tax plan doesn't really serve your interests. But conservatives simply do not rate caring and fairness as highly as liberals do or rather to put it a different way, conservatives have different ideas about the meaning of care and fairness than liberals.
Like many wannabe tough guys Trump is super sensitive to the charge that he's not a tough guy. Liberals should say that Trump didn't have the guts to stand up to the fat cats in Washington. Trump ran on the idea that the other Republicans and obviously all the Democrats had all been bought and paid for by plutocratic special interests. Trump ran on the idea that he and he alone had the stones to stand up to these monied special interests and bring good paying jobs back to Middle America.
Despite Trump's impressive electoral victory, the actual voter margins in key states (Michigan, Ohio, Pennsylvania, Wisconsin) were small. A few people who change their minds over the next four years could make a big difference in 2020.