Joseph wrote: “there is no issur to embarass a goy”
Public humiliation is a very serious sin (“kol hamalbin… k’eelu shofeich damim”). Even though the issur b’etzem refers to chaveiro, chilul Hashem is an important consideration here. Possibly even mishoom eivah, as well. (In addition, a goyah is not exactly in the same category of arayos d’oraisa as a Bas Yisrael. As such, the parameters of lo sikrevu as applying to a goyah are not necessarily so clear cut).
P.S. To Joseph, and to the mods: This forum is a reshus harabim. V’dai l’chakima birmiza.