I know people who voted for Trump who I honestly do not believe are sexist or racist, including people in my family and my partner's family. Well, unless you go with the Avenue Q philosophy that everybody is just a little bit racist. But there were a good number of Trump voters (again, including family members) who were Obama voters, so even IF they were "a little bit racist," it wasn't enough to stop them from voting for a black president. But from the people I know, I can tell you that the single biggest reason anyone I know voted for Trump was only that he wasn't Hillary Clinton.
While misogyny was certainly a factor that worked against her, that's not the one and only reason people really didn't like her. And you know, it's hard enough to get a Republican to vote for a Dem, and no matter how much they may have disliked Trump, Hillary was pretty much never going to be a Dem they would cross over and vote for. I know at least two people who typically vote Republican, who didn't want Trump, and might have crossed to vote for Bernie, but were simply never going to vote for Clinton.
And from a practical viewpoint, look at the date of these tweets, two days before election day. There were still people torn about who to vote for. This would be a very stupid time to insult voters on the edge by saying that, if you're even THINKING of voting for Trump, you're obviously sexist or racist. Not a way to win friends and influence people. You have to show empathy, not antagonism.