In an alternate universe, where Superman (at first) was simply a kid called Clark Kent, who was always teased because of his name. Mike was one of those people. A persistent one, at that.
He really got to Clarks nerves. But then, after a while, Clark didn`t mid that much anymore. For some reason.
When Superboy appeared, Mike became his fan.
One day, in a Halloween party, a few gas pipes exploded, and he got hurt. He spent ten weeks in a hospital, and got better. And because Clark had saved Cassie (a girl he liked) during the incident, he didn`t bully him anymore.