Annoying kid in my Phys Ed class

So there's this kid we'll call (L). (L) is one of the more irritating types of people for both teachers and students. Like a downgraded class clown. He constantly shouts out, interrupts the teacher, and insults other students.

He'll also say things like "my bad, I'm autistic". (L) actually is autistic, so in it of itself, it isn't a bad statement. It's the fact that he says this as some sort of defense against his grating personality.

This is also the guy who's been bullying me since middle school and saying things like "if you disappeared nobody would miss you" and repeatedly telling me to off myself. This is targeted, as I'm the only person he says these things to.

All of this to say; what do I do about this? I've tried ignoring him, yet he still says this stuff unprompted.