I found mine at Safeway (a local chain) so hopefully they're distributing it pretty widely.
I agree, Zappa can be offensive, in the early years he seemed more conscientious and political, things got more and more juvenile and sexist as time went on. I tend to just listen to the instrumental stuff! But the first album that turned me on (so to speak) was Fillmore East...
I don't think the beer itself is any different, just the label.
Plus, it was fun to pull out my vinyl copy of Lumpy Gravy! There's an instrumental version of "Take Your Clothes Off When You Dance" on there, even though the song titles aren't listed.