Oh yes, we have lots of those here! DS8 (with Asperger's) has no filter whatsoever to tell him that you shouldn't say every little thing that pops into your head, and he also has a lot of inflated ideas of violence from cartoons and video games. It's quite a battle at times! He does go to a shrink, as well as the counselors at school, but a solution he comes up with there does not necessarily translate to the next time something sets him off. He has received a couple of "bully slips" for things he's said, which seems a bit overdone considering that he is close to being the smallest kid in his class (and is the youngest), and is also a skinny little thing who gets picked on himself because his buttons are easy to push.
So yes, to me it's "normal", but that doesn't mean I have any solutions for you!