End the liberal branding that they are smart, tolerant, educated, moral and everyone who disagrees is automatically branded stupid, ignorant, crazy, bad.
This branding by the left served them well in several respects. It lets someone utterly dismiss any contrary opinions, it gives an easy answer to dismiss topics one wants to explain away as caused by bias or solved by "adopt liberalism". And it makes a lot of people feel good, "if I join this tribe, I'm automatically assumed to be smart and good no matter what I do?" This view enables liberal bullying, where one could join hate mobs online or in person to scream at people, destroy property, try to destroy a livelihood and threaten murder - but it is OK, because you're doing it for a good cause. Hence the beatings of whites in various BLM and anti-Trump riots seen as justified, along with death threats and assaults regularly committed by SJWs.
Yes, this made conservatives angry. To be demonized on the basis of demographics in some cases, to be told "you're bad, shut up" when trying to discuss matters from illegal immigration to bad social policy implementations in schools to Islamic terrorism. In the past two years, it escalated with SJWs not only disrupting conservative events on campus but disrupting public events, assaulting speakers and audiences alike. For example, the San Jose CA rally where Trump supporters were chased down, hit with rocks and eggs for merely being Trump supporters. Laura Southern and Milo Yianapolis were hit. Death threats are common, too. And for the authoritarian left, all of these fascist actions are acceptable to them and tolerated by those in power ...
If you can be beat up and threatened merely for your race or political views (see the black homeless woman beat up by liberals for defending Trump's star, whites assaulted by BLM mobs in Charlotte), wouldn't you support the law and order candidate? Versus Clinton who agreed with their violent ideology and actions.
Nor is it all anger. Fear of the totalitarian demands of the left and their stated goals of destroying freedom of speech, press, greater regulation of all personal and economic decisions, etc concern many.
And that's ignoring identity politics that tie approved beliefs to various groups and demonizing those who fall out of lockstep (see bad treatment of conservative blacks like Clarence Thomas, conservative women, etc).