Something bothers me about the view that you are not a Buddhist if you break a precept. First of all, it seems rather provincial to me. Secondly wouldn't be best not to carry that label around? Isn't that a view of Self in and of itself?
Of course intoxicants are to be avoided. Clarity is the key to seeing the reality of the world. The issue comes when one finds the teachings of the Buddha at a time when they have already developed an attachment to said intoxicants. How can we expect perfect sila on this issue and yet, anyone who watches their own mind and habits realize that just dropping attachments isn't that easy. It takes time. Any sense desire is dangerous. So we kick out anyone who approaches the Dhamma with an attachment to intoxicants but let everyone else in who has yet to reach sustained purity and detachment? Where's the compassion in this view?
Ajahn Chah has a more balanced perspective. I'm paraphrasing but he says something like "If you are attached to these things just use them less of them, and less often, than you did before. In time you will let them go."
This thread reminds me of the Elephant and the Blind Men. I see all interpretation here so who really knows. That's up to the individual to hash out.
"To avoid all evil, to cultivate good, and to cleanse one's mind — this is the teaching of the Buddhas" - Dhammapada 183