Important to note this is a study regarding perceived incivility, the data derives from interviews and questionnaires, per the methodology:

>... After that, participants, in random order, were asked only about the specific social media platforms they indicated using, with questions covering frequency of use, different types of use, social network characteristics, and perceptions of uncivil behaviors on the platform by both self and others.

Perhaps this says more about what people of different platforms would call "incivil" and the normalization of certain behaviors as "civil" than it does anything else.