It is usually unwise to mix insults with requests. However,
the point of collaboration is not to obtain the civility of a
collegial discussion over tea; the point is to accomplish the
task. Continual discussion of issues that are not relevant to
the task being collaborated upon is not collaboration -- it is
being a pain in the ass.
Folks, you don't have to respond to every comment, and especially
not this one. If it isn't relevant, you'll get more done by just
ignoring it and moving on.