Yes, that is true, but it's a bad reaction because it's anti-intellectual at its core.
Just because the thing(s) being reacted against, in this case political correctness and post modernism are bad, doesn't make the reaction against those things automatically good.
Lots of people talk like Trump is somehow good simply because he opposes political correctness, well the sickness can kill you, but so can the antidote...better to find a better, safer antidote...
On a side note, I don't think globalism (another thing you mention people rebelling against) is that bad. Being open towards the outside world is better than being closed off to it. It does have some negative consequences for some, yes, like the movement of capital leaving some areas penniless and the outsourcing of cheap labor but I think the consequences of rolling back free trade would leave people worse off. Countries should be able to control their borders, if only for the safety of their own citizens. I am mostly pro immigration but I do think government should be able to make harsh decisions if they have to, to protect their citizens. I do think that racialist theories about whites being replaced are bullshit though. It seems to me that international organzations iike the EU and the UN consist of career politicians oneupping each other, too, which is why any opposition to them labels you a heretic of sorts. You gotta be polished and right-thinking.