5 year old smearing poop

Is this normal behavior? My stepson has repeatedly done this the past couple visits he's been here to visit his dad. He will use the restroom, we ask every time if he's washed his hands / flushed, usually we check too but this time we didn't. After my husband had already dropped him off I went to the bathroom and noticed poop smeared all over the cabinet and bathtub! I freaked out bc I'm ocd and a germaphobe. He called his ex and she's just like yeahhh.. he's done that lately, I'll talk to him again.... like is this normal?? because I've never seen anything like that before. He's been told several times that it is not okay, and it's disgusting. He knows he can ask for help or say something. He doesn't listen to anyone, he screeches when he doesn't get his way, he back talks, and storms off when he's told to do something. Like at this point idk if it's bad parenting on their part, or if something else may be going on but I'm just at a loss.