I haven't been to Biergarten in over 10 years, probably just as long between visits at the restaurant currently known as Teppan Edo.
I don't recall having any issues there, but then again, I'm the stranger that other strangers want to talk to. I must have a vibe that says, "Tell my your life story!" because they
do. I should probably revisit these places just for the entertainment value alone.
But ElizabethB did bring up a good point about the food and wine festival. I don't know if I'd consider myself a high class clientele, but I do know my way around the cutlery placement.

Even though the signature and reserve dinners were a thing of the past in 2008, I still had found meals where I was seated with strangers.
One was a French Regional Lunch event at Bistro de Paris, and the other was one of the monthly wine dinners that Jiko held. I knew one couple going, but the rest of the table were all strangers. Nobody stood on ceremony, and all of them talked with me as if they'd known me for months.
The people at these specialty meals know what to expect, so it comes as no surprise to us that we'll be seated with strangers. I'm guessing the average theme park visitor would not know that they'd be seated with others at Biergarten and find the situation extremely uncomfortable.