Poshut:
“We should not drink with them, but that doesn’t mean we can’t be friends with them. “
The reason chazal instituted that we shouldn’t drink with them is in ORDER THAT WE DON’T BECOME FRIENDS WITH THEM. There are many other stringencies by chazal that stress the importance of keeping ourselves separate from the goyim.
Rebbe had a relationship with Antoninus, because these two giants were the fulfillment of a nevua made thousands of years earlier (when rivka was pregnant with the twins). To infer from that relationship that it’s okay to have social relationships with goyim is to ignore everything else the gemara and halacha has to say on the subject.