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".