What we get is Mike worried about being teased.
Panel 1: It's a few seconds after Lawrence and Mike's little scuffle and Lawrence says that he was just foolin' around an' a scowling Mike didn't hafta get that mad.
Panel 2: He was just teasin' Mike. Deanna probably didn't know what he said. Mike's response is to murmur "Hmppph".
Panel 3: Lawrence reiterates himself by saying that what he said he liked her, she didn't do anything; she prob'ly didn't hear him.
Panel 4: As a group of mutant children laugh in the background, Mike points out that everybody else did.
Summary: Since everything in his life is about appearances, Mike is horrified that people know that he's not what he seems to be.