So many points, firstly the food was spectacular - exceptional.
I just struggle to sit next to those who feel the need to comment throughout a meal, sitting far too close to me. My preference is to dine with my partner and meet others on a social level then choose to dine together. It’s wonderful and far more natural.
If you’re unhappy with your position in the restaurant to offer a tip or gesture without ‘complaining’ or moaning and causing a difficult difficult situation doesn’t seem untoward to me. That’s my view. I personally feel rather embarrassed to hear others making a scene. But having said that I also feel it’s lovely to tip beforehand.