I agree with sparklekitty, either this behaviour from him is acceptable or it isn't.
Are there are any circumstances where you might accept this behaviour from anyone (friend, family or employee) what would those circumstances be?
When you say he ranted, I assume you mean to you. Is that ok? He then barges in on you when you asked him to wait, is that ok, meth or no meth?
You are probably scared now, is that ok (again, meth or no meth).
This is really about boundaries, what you will or will not allow in your life and how you wish to be treated. It might be a good idea to talk to him about it?