On average, you would probably have similar % numbers of rapists, murderers, thieves, on either side. These categories of people aren't supporting either candidate en masse.
However, racists, bigots, xenophobes, homophobes ARE supporting Trump en masse.
You're right, and going by the survey data Giga posted in this thread the biggest proponents of Trump were the most racist group in the primary cycle. Clinton's supporters were less racist, and fairly significantly so, but not so much so that it seems wise for her to classify 1/2 of Trump supporters as irredeemable or deplorable.
From the charts it seems like roughly 30% of Clinton's supporters are raging racists and 44% of Trump's are. That is a significant difference, but it's depressing for two reasons:
1) The candidate with the most racist supporters won in both primary
2) Even Clinton supporters, which are obviously much less bigoted than Trump's supporters have an alarmingly high amount of racism within their support.
If the difference was something like 50% of Trump's supporters being racist and 10% (or ideally less) of Clinton's then a statement like hers would make more sense.
In this thread there is a tendency for any statement not 100% in support of what Hillary said to be twisted into support of Trump, false equivalence, etc.. That's not what I'm doing. I hate Trump. He's easily the worst candidate of my lifetime. I also agree that the Trump supporters are less informed and more bigoted. I just think that in this discussion we overlook the fact that the American people as a whole have a lot of work to do, and that Trump supporters are the worst part of that they're not the be all and end all of shitty views among the electorate.
Talking about race in relation to this election will be important. What I would have recommended would be that she avoided this, continued on her course, focused on the debates, which should provide her an incredible opportunity to showcase professionalism and knowledge against immaturity and ignorance and then after winning the election use her position to begin a dialogue about the harmful issues and stances that came up during the election as a way to force people to reflect on some of the ideas that came up during this cycle and better understand why they were so wrongheaded. We can't just go on as if the anti-Muslim shit did not happen and pretend that because an election was won with 55/57% of the electorate that all is well.