I've noticed that too. I just figure they are too busy trying to break yesterdays personal best by few 10000th of a second to be nice to anyone.
OH also since the advent of brifters I think a lot of people are just frightened to take their hands off the bars.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk