My children both have autism and my youngest also has adhd. I understand completely how distressing moving her furniture about etc would have been for your daughter. When something happens that my youngest is unable to cope with, he swears, or lashes out or throws himself to the floor or puts his hands round his throat and tries to strangle himself. He is not responsible for these things in the way that people who do not understand autism think that he must be. He does them because that is the nature of his disability. Your daughter is no different.
I understand that you aren't dealing with an NT child. It is a different world and your daughter cannot be blamed for things that are as a result of her disability. But for the nature of her disability, would she be utterly distressed by change? No. But for the nature of her disability, would she be enraged? No.
Should a man - who knows he is dealing with a child who due to her disability is unable to handle change and is unable to respond in socially acceptable ways and who may externalise her distress - just decide to walk into her room and shift things about, knowing that is a trigger for her? And then, having created that situation and got a response that while in another child would be totally outrageous, in a child with ASD could reasonably have been predicted to happen, threaten her with violence?
Makes no more sense than threatening to slap a blind child for tripping over a box you left in the middle of the room. People can't HELP being autistic. They don't choose to display autistic behaviours and it shows a staggering lack of understanding of the condition to think that an autistic child in a state of distress can manage their behaviour in an nt socially acceptable way.
He is in the wrong.
Why did he just decide to go and do that anyway? When he knows he is dealing with a child who would be massively distressed by it and would be unable to cope?
Obviously as part of supporting her, you need to and I am sure you do, talk about the importance of behaving appropriately and I am sure you will have the conversation that happens here a lot about how unacceptable it is to swear but for crying out loud, he should have known better.