My thoughts too. I have to think there is more, or at least i'd LIKE to think so. After all, this is Texas (where commonsense still prevails most of the time) and not California. So what led to that exchange and what came after it? And how much Is the father downplaying the event? And does his son have a history of violence and/or psychological problems that we aren't privy to?
The fact that he keeps getting beat up tells me something is not quite right with him. I mean, i'd expect to have heard Zimmerman getting beat up but not this guy, not unless he brought it upon himself to some extent at least.
Maybe it's what he posted and the reason he is in jail that is the cause of him getting beat up. It involved children.