My quarrel with the college/no-vote correlation is that it's the equivalent of calling the other side stupid.
"You just have these opinions because you're uneducated. If you were smart, you'd think otherwise."
Someone who agrees with the position feels vindicated (elitism yay). Someone who disagrees feels insulted and is provoked to a response of antiintellectualism. As if we hadn't enough of that already.
It's okay to state the truth. The map is the equivalent of smugly rubbing it in.