Very timely book. great that it explicitly calls sexism an important source of fascism. it's ideology on gender and gender roles is often overlooked.
The book focuses on how mostly white, mostly young, mostly male persons might be attracted to fascist ideology in various forms. With it's ubiquitous presence online, offline and in our politics, it is a certainty that a young person will come into contact with these ideas.
The main advice for dealing with potential fascist leaning youngsters in a private setting (for public confrontation a whole other setbofnadvices are available) is empathy and curiosity, finding out what is the motivating forces are. and making sure that it is clear that you do not agree.
The book contains many examples, but as a practical resource still a bit too little example conversations or vignettes.
in public; watch your own and other's safety, but try to confront these ideas as much as possible. Not saying anything makes it seem as if these ideas are commonplace or accepted. And they never should be.