Apples and people that are orange
By lumping Brexit and cheeto jesus together Kotkin muddies waters that are already muddy. Extreme positions exist in both camps, Progressives and Conservatives, but in the states the fact that a Republican has crossed party lines and voted with Democrats on any issue will get that Republican bounced out in the next election by their own party. It is almost impossible to believe anyone that has done any research would not be aware of that. If Kotkin is just talking about people on forums, what does that have to do with anything? He probably doesn't even know when he's being trolled.