He's fine, but his naive leftism and focus exclusively on the interests of white male union workers are annoying.
Where have I focused "exclusively" on the interests of white male union workers? Your assertion here shows more about what you don't know about the labor movement (the fact that it's majority non-white and about half of union members are women, for starters) more than it speaks to my purported naivety, does it not?
Its not necessarily a conscious focus on your part, and Lief is obviously exaggerating, but I do understand where he's coming from. And I dare argue that all protectionists are focused on preserving white dominance in some way or another.