It's because we've worked at startups where MBAs were brought in on the middle management layer and wasted our time polishing nuts and bolts in order to reduce drag when what we should have been doing was upgrading the suspension from a Watt's linkage to MacPherson struts.
Not every tech is lousy and incapable of understanding that IT needs to serve business needs, even though lots of MBAs think so.
Broad brush hatred of all MBAs is moronic.
"My god, he decided to supplement his education by learning the basics of accounting, finance, marketing, and a bunch of electives! Fear him!"
So lame.
This has nothing to do with the concept of the MBA or the courses, but more to do with the type of people who feel drawn to a short cut to senior management or influence over senior managers.