[bhauer]

> OP author here: the rivalries there are directional, "if you liked X, you probably disliked Y", but not vice versa. (One thing I find interesting is that most rivalries really are directional: you see git users disliking svn, but not svn users disliking git).

Awesome, thank you! I agree that the direction of the rivalry is an interesting part of it.

I just noticed that "backend : frontend" and "frontend : backend" both appear on the chart, which implicitly answered my question.

Perhaps another sentence or two that highlights this would help readers understand the directional nature of the chart. For example: These rivalries are directional, which demonstrates how rivalries are often asymmetrical. For example, as seen in the results chart, those who like backend have more distaste for frontend than vice-versa.