I teasingly told OG to "stop with the peer pressure" and in response OG said she wouldn't stop until H drank.
I had to deal with a similar situation - in a restaurant. I had foolishly let someone drive me there, so had no way to leave.
I was 4 years sober. One guy would. not. let me alone about not drinking. Like OG, it was obvious that he would not stop until I drank. Politely declining didn't work; getting more firm didn't work; and when I got snippy, he said, "See? You need a drink to relax!" That repeated a couple more times.
Finally, I resorted to obscenity, loudly. I really can't think of any other way I could have handled it. If I had driven myself, I could have just said, "I'm sorry I'm making you uncomfortable. See you tomorrow."
So, OP, you did the right thing.
By the way, nothing similar has ever happened to me in the 29 years since... thank Heaven!