M.P.
Typical kids often bite at this stage. I suggest you protect yourself while telling him that hurts and give him an immediate consequence. What consequences do you use for discipline? My daughter has 3 kids on the spectrum. She puts them or sends them to their room until they can be safe. Sometimes they play and come out when they've calmed down. She doesn't always comment on why they had to go to their room. Sometimes she does. If she says something and they are still upset the go back into their room.
The reason for being in the room is to reinforce safety. They can play, watch TV or cry. Staying in the room is the entire consequence.