I can imagine that many of the relatively few real racists in America felt sort of a confidence boost by Trump's victory, and some of them might even believe we're going into a new era where display of open racism becomes more acceptable. So what we might see here is how nasty people dare to express racist sentiments more openly than they dared to show before the election.
But we have to remember that this isn't an established fact. The examples in the twitter thread (or whatever it is) are circumstancial and might, or might not, reflect a real life trend. Let's not draw conclusions before we know the facts.
But even if it is an actual increase in racism expression, it might very well be temporary. I believe that things will go back to normal within a few days.
Generally speaking there aren't many racists in the West and racism is a relatively limited phenomenon. It's blown out of proportions and used as a tool against the majority population by people with an agenda.
Are you a minority? Because if you are not then you will realize that racism is part of your everyday life. That white lady that moves to the other side of the street instead of the side you are on. The looks of concern when you go into their neighborhoods. An older lady once asked a co worker whether or not it was legal for me to be there instead of on the reservation.
White folks have asked me when was the last time I made a rain dance. I've been called chief, brave, buffalo rider, prairie n*****, was asked where my tipi was, told to lay off the fire water, and one time a girl just straight up walked up to me and gave me a indian 'how' salute.
I live it every day. I'm glad you live in a racism free world. Some day I hope to live in one too.