Even if we grant that MGTOW are recycled misogynists and male supremacists, it's not a necessary logical consequence that they'd "go their own way" as a result.
I just came across this
Economist article, which talks about the rise in the number of individuals cutting family ties — something that is historically unprecedented. The article implicates the rise in individualism as the primary cause, now that people are less patient in dealing with perceived impediments to their happiness. Self-help literature and internet message boards are amplifying this by encouraging questioners to cut ties with problematic family members.
I believe that MGTOW is either directly part of this trend or a reaction it.