Wikipedia:How you edit
Essay on editing Wikipedia
From Wikipedia, the free encyclopedia
Criticizing how other editors edit is a weak argument. Content is not related to editing style.
This is an essay. It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article or a Wikipedia policy, as it has not been reviewed by the community. |

For example, pointing out that someone only checks article categories and doesn't create "real content", only points out that they do something you don't, thus helping to complete the tasks necessary for a quality encyclopedia.
Different people have different styles of editing, but Wikipedia is about content, not about judgement.