i don't think that they can expect to be ignored. but a few "good luck tomorrow!" comments thrown their way shouldn't be treated with disdain. those fans impeding the cars' progress might have pushed it a bit. lining up on the side and just cheering to me is fine.
that being said, i live downtown so i see celebrities relatively often enough but i just admire them from afar. i think the only time i've ever said anything to a Canuck was to AV. Told him he coached a good game the night before. He said thanks with a smile.