I don't see how you could take this goofy little dipshit seriously enough to be mad at him. He's a five foot special needs disaster in his grammys attic. It's fucking hilarious.
You're right, and you shouldn't be mad at him.
Assuming you're talking about Marty, and my explanation of his hate, I think it's about the betrayal, and the refusal to back down. At that point, Marty had watched him freak out over the Bender Boyz, he'd watched Dead Heather being abused in live stream, and he saw Raxx and Dead Heather actually call the police on Jayme Nicole midstream:
Not to mention, Dead Heather planted the idea in Raxx's head that Marty blew up her fucking car.
So he should've expected...maybe something. But...
Grief is a fucky emotion, and it effects everyone differently. I'm watching the old Juggalo Drama Alert reporting this, and Jayme's son just found her dead. No hospital stay. No warning.
That's TylerBSR talking about it at the start (Hey Tyler).
Tyler says Marty is freaked out, and "Marty doesn't freak out about anything."
ETA Listening further, and multiple regulars on these streams are confirming that Marty sounded really fucked up when they called him, and Marty didn't want to panel up (Marty is always down to panel up).
Maybe Marty expected Raxx to be respectful, as the other retards he streamed with probably were, but Raxx wasn't. He's screaming that Marty killed her. Marty had streamed with her the night before.
Less than 24hrs pass, and the person you loved is dead with no warning. It's fucked up.