Answer:
He says people believe the worst of him because of his size, because of the way he looks.
It could have been true at some point, but not anymore, because Kenny is really a cruel person and he did commit a murder. So his claim that people think he commits crimes because of his fearsome looks is not true.
Explanation:
In Freak the Mighty Kenny Kane kidnaps his son, Max. He tries to make Max believe that all the things people say about him are not true, that he is a victim of a cruel belief that he commits crimes just because he looks a certain way.
Kenny says, "As if a man should be blamed for how fearsome or cruel he looks, when in fact he's a truly loving person inside" to convey to Max that people just cruelly think he commits crimes because he looks fearsome, but he doesn't actually commit any crimes.
