My student of 8 years just told me “fuck you” and I don’t know how to handle it

I’ll try to keep this short, I am a resource room special ed teacher in a public elementary school. I have one student who we’ll call Jake. I’ve had Jake since he was 5 years old and he is now 13 years old. He has severe autism and my room is his academic home, even though he is officially on 8th grade. Jake is nonverbal, has difficulty with transitions, and is obsessed with colors. We’ve had a great relationship for 8 years, we can usually communicate through signs, pictures, and color cards. Today, I asked him to do a worksheet in a group, and he started to throw the papers that were handed to him. I asked him to please not throw things and instead he said “fuck you.” Loudly. In front of all the other students. I was shocked and told him it wasn’t okay to say that and he kept repeating it. I calmly told him it was not okay. I tried to redirect him to a color activity. He has been saying “fuck you” since that moment and it’s driving me insane. I’ve tried talking to him, redirecting him, even taking away a beloved color item for a short time. Jake usually knows and understands when he has done something wrong, but today he’s just being defiant and not listening. I called his dad who’s on the way to pick him up and take him home. He’s usually not like this! I’m so lost!<br><br>Edit: Jake left to go home with his dad. The rest of the day was fine, the other students were distracted by their lessons and didn’t think much of it. I’m going to call Jake’s dad tonight and give him a heads up about tomorrow. I think I’m going to try and see if we can find a way to communicate why it’s not okay to say swear words. It might be because Jake is getting older and wants to sound “cool” like the big kids. It’s 8:30 PM and I’m finally done with work for the night, time to go watch some TV to relax! Thanks for all the advice and stories.