Gonzalo pursued violent revolution despite demonstrable lack of popular support, which under different theoretical branches of Marxism (marxist-leninist) would have been abandoned in favour of alternative methods until the correct conditions arose to have popular support for violent revolution.

Lack of discipline within the ranks also lead to particular excesses that are universally condemned, the most famous of which being boiling babies. Although Gonzaloites will claim that's propaganda you won't see anyone that isn't a Gonzaloite defending it because the evidence was too strong.

While most branches of marxism can at least agree to disagree with various other branches, you won't see much love between any branches and Gonzaloites. They're pretty much universally condemned and shoved off to the side by the rest of marxism.