Same thing. When safety is in the balance better to speak up.
Years ago I was in my Dodge pickup truck. Ended up behind a young woman driving some British sports car with New York plates. Noticed a rear tire low. Got out and walked up to her window and told her then turned around after she acknowledged the observation. On way back to truck heard her ask someone in the vehicle next to her's about the tire. The reply was it "looks ok to me".
The light changed and I followed her car onto the freeway and wouldn't you know all the way down to the next exit. I was stopped behind her car. We then both turned left and I could see her now looking in her rear view mirror and locking her car doors and rolling up the windows. It just so happened I was on my way home and that was my way home. But fortunately I came to my cross street and turned off and went on home.
More recently, but still a few years ago, pulled into a 7-11 and parked. I was in my Turbo. As I walked past another car I couldn't help but notice the left front tire. It appeared to be a unidirectional tire that was installed in the wrong direction. I stared a bit then looked at the other tires.
Behind me I heard a guy say: "I think that guy just hit your car." 'course, by "that guy" he was referring to me. The driver of the car I was looking at, another young woman, comes out ready for war but I just explained to her why I was looking at the tire. Turns out it was installed the wrong way. She settled down and thanked me and that was that.