He mentions honey beer, IIRC (ShA mentions sheichar shel temarim and sheichar shel dvash, and I’m pretty sure he’s talking about sheichar shel dvash). The Rema mentions this davka, and indicates that it is mutar for Jews to drink this among gentiles. The Mechaber says all kinds of beer are asur to drink with goyim, and the Rema says that people in his country were lenient on drinking alcoholic beevrages of honey and grains. And I did say that going to a coffee house, per this logic, is asur, since that would pose a problem of chatnut, as well. The Rema says explicitly that people would drink sheichar akum shel dvash, and even barley beer, also.
And Rav Schachter actually does forbid hanging out in Starbucks. However, very few people converse in Starbucks. Most are on their phones or on their computers, and in NYC, there’s very little socializing going on.