Both evil and rude, but with the additional connotation
that the rudeness was due to malice rather than incompetence.
Thus, for example: Microsoft's Windows NT is evil because
it's a competent implementation of a bad design; it's rude
because it's gratuitously incompatible with Unix in places
where compatibility would have been as easy and effective to
do; but it's evil and rude because the incompatibilities are
apparently there not to fix design bugs in Unix but rather
to lock hapless customers and developers into the Microsoft
way. Hackish evil and rude is close to the mainstream sense
of "evil".
