This spot is my kryptonite. When it happens I just open up the apps or start looking around for another gal because it certainly feels like a lose lose. I see two moves you can make:

1.) Interject (this is an obvious no-no and have not nor ever will do this) - if you interject, you immediately come off as a jealous insecure pussy and thats game over call the uber

2.) Ignore pretend to not even notice basically - This makes you come off as a weak pussy especially when it just goes on and she doesn't shut it down. What're you gonna do? Stand there with your thumb up your asshole far enough to come out of your mouth and give the guy pulling this stunt a thumbs up?

these are just straight up lose-loses, what's the play here?