Democracy doesn't work because it produces a result you don't agree with. Yeah, ok
It's modern politics isn't it. Arrogant prats telling everyone they're idiots for holding a different opinion to them. Everyone's an expert in 2019, despite people who know considerably more about politics than you or I voting for him by a massive margin.
Knowing a lot about politics doesn't really mean much, because it all still boils down to your own ideological views. If I decided to devote my life to learning about politics and championing National Socialism, does that mean my view holds more weight than the average person in the street who doesn't know a great deal but believes that, you know, Nazism is not the most desirable choice? I'm not an expert in politics yet my ideological views are pretty much fixed. A lot of reading is going to have an influence but it's not going to alter them substantially at this point in my life. Hence, it's strange to attach credence to people backing Johnson on the basis that they supposedly know a good amount about politics.