My client in Reno said the same thing about her bangs last month and I just nodded and fixed it, then went home and practiced on my mannequin for like 2 hours. Honestly asking them to show you the angle is smart though, they usually remember more than you'd think. Two years is nothing, I did the crushing thing for way longer before anyone told me.

Fame is just a loan that gets called in eventually.

Wait, your buddy just stood there watching you sand for that long before saying something? My buddy did the same thing to me last summer on a quarter panel, let me burn through like four sheets before he finally goes "you know you can just use less right." Blew my mind how much time I wasted.