[He's not expecting that, since no adult ever hits him (threatens to, yeah, but never follows through). He lets out a surprised cry when the slap hits, gingerly touching his stinging cheek and fixing Perry with a vengeful scowl. His eyes are watering a little, both in pain and in anger. He lashes out with a shove, a small act of defiance, largely without thinking.]

Fuck you! You can't hit me; you're not my fucking dad!