Obviously I don't know your ds, but that seems like a bit of a knee jerk reaction to me.
Several things spring to mind:
Is he in mainstream? Does he have an EHCP? If he is and he hasn't, apply now... parents can do this and SHOULD.. you don't have to wait for school to do so and it's a long process.
What support does he currently have in place? Does he have a TA? IS he verbal or pre verbal.. does he use PECS, or any communication aids?
Behaviour IS communication and he may be frustrated or not understanding things but that is not unsurmountable and sometimes simple aids (picture time table, now and next symbols, photos etc can make a big difference.
I have a (now adult) son with autism, and have worked in Special Ed for 20 years. He was non verbal and would have been very happy at home... but school helped him to develop SO many skills and you are very early days.
If he's in Special School... really don't worry; we are used to it, and children settle and develop :) If he's in mainstream then maybe the setting isn't right for him, and again he needs an EHCP, but honestly he's very little!
Homeschooling is definitely right for some children, but it is a massive committment; if you have the resources (and don't need to work) and the ability to teach yourself, you have a great option, but if not I would want to work with school..or find out schooling options before throwing in the towel because he's 'happier at home'
My ds would have been very happy at home, but at school he learned to interact, to talk, to develop skills I was not sure he'd ever had.. it just takes time.
Check all your options , find out HOW to support him before just withdrawing :)