Most working class people absolutely do not give a shit about China or North Korea. Talk to them in real life. They are more concerned about what's going on around them. The same applies for the Russiagate hysteria. Only libs care about that stuff.

Working class solidarity has to be international, otherwise you end up with a bunch of nazbols.

The US don't even have a working class movement right now, but go ahead and lecture the workers you know how they really need to believe in China being a communist utopia and North Korea really isn't all that bad. That will totally get them to listen to you and want to read Marx.