i was there 6 years ago. beer scene was still bad, but there was a micro in the Golan and a micro in Rosh HaNiqra.
not to get political, but i think what you were told about Taybeh being smuggled in is inaccurate, as is its exclusion. israelis love palestinian food and cooking. i'd assume beer is no different.
your comment about wine is hilarious. israel is known as being a very underrated wine country. in Tel Aviv, i walked into a wine store and was amazed at the local selection. the Galil and golan are known as having amazing climates for wine growth.
I still don't know if it was Taybeh. Basically I was told that goods being shipped through check points were regularly turned back as "security threats" unless enough bribes were paid (probably an exaggeration, given the discipline in the Israeli security forces). It seamed to especially hit smaller producers who did not have official networks of distributors in Israel. It could be exactly like trying to import into Ontario without LCBO blessing for all I know.
I did see explicit economic discrimination against local Arabs that shocked and disappointed me. For instance, being handed a tourist pamphlet by El Al staff at Ben Gurion upon arrival that discouraged hiring Palestinian taxis because they would "rip you off". The effort backfired as I only took Palestinian taxis after that and later found out that the prices and service I received were much better than the norm. People have to live and feed their families. If you want to build a peaceful and civilized society you need to lose the tribalism and dehumanization of others. Surely, I would think this would be well understood there...