I don't know if we ever learned Zeddmore's background beyond it not being science. (Which is why I find the "four scientists" thing at the start of the trailer kind of odd.) But if I had to guess I'd say yeah, almost certainly working-class.
-- Bob
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Then the horns kicked in...
...and my shoes began to squeak.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.