actually the person was female!(and not bigger than me!!!)
The only way I could think of was to ask " what do you use on this runway,as a general rule of thumb, as a downwind reference point?"
She then got really snotty saying that she had 7 times as many hours as me and that she was "still within gliding distance" and not to comment on her flying skills ever again!!!
I think I may have hit a nerve!
I also think that many people will "fly off the handle" if you are even a little bit untactful about this issue!