Sure, but if someone gets put out or upset by a polite request, it's on them. At that point I would involve a manager. People can't read minds; we have to be able to express themselves directly. Or, make a decision to put up with the situation.
Blaming the restaurant staff for not intervening without actually telling them something is wrong - maybe so far as they could tell, everyone was happy and having a good time - is not reasonable. They can't do a good job without feedback of some sort.
I'm not one to talk to random strangers either, so I know where you're coming from. But these sort of interactions happen all the time in life. Responding to them is just a learned skill that gets easy with practice.