MinnMan

I almost always bite my tongue in these situations, and it is surely the right decision. I can think of two relatively recent times where I failed to bite my tongue, one which I regret and the other I do not.

Both on club rides, talking to younger guys whom I didn't know.

The first one just had this very strange pedaling style - his heels stay way up high, maybe 2-3" above his toes. I asked him if that was a deliberate choice or perhaps something he could improve on and he snarled at me. He was right, I was wrong.

The second one, a guy I had never seen, joined a club ride and was blowing us all away - he would get in front and drop us all and then wait for us to catch up. This is a group where the average age is probably mid-50s, and this guy, I later found out, is 23. I noticed that his stem was way up high so that his bars were well above his saddle, and he was catching a ton of air. I asked him why his bike was set up that way, and he replied that he had just bought the bike a week ago and had never before ridden a road bike (!). The ride finished at something like 18.5 MPH (medium-fast for that group) and he enthused that he had never ridden so fast in his life. So I told him about a younger faster group in the area. He rides with them now, his stem is down low, and I see him nabbing KOMs on Strava all over town.