Why should he be worrying about what some hiring manager thinks if his goal is to found a startup when he gets out of college? How much are customers going to

Why should he be worrying about what some hiring manager thinks if his goal is to found a startup when he gets out of college? How much are customers going to care where he went to college? Some potential investors and employees might care, but by the time these people really matter, there should be better evidence (the progress of the startup) upon which to make the judgment; if they still care about his undergrad institution, he'd probably be better off without them.