It sounds like he's some sort of Chaotic Randumb arsehole just trying to fuck up everyone's fun for his own lolz.
But maybe try asking him why he's doing all this dumb shit.
If his answer is something fucking stupid like
"I'm just doing what my character would do"
Then tell him it's a group game and he's fucking it up for everyone.
As DM it's your job to make sure everyone is having fun, even you.
If he's interrupting that shit then either kick him or school him on how to play the fucking game without being an autistic cunt.