Photographers at races - blinding flash?

Anyone here been put off by flash during a race? I am a bit wary of using one and someone else has mentioned it as well, so just wondered if anyone here has had any negative experiences racing while someone is snapping away blissfully unaware that he or she is zapping your eyeballs with more watts than your pathetic legs are capable of producing...
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XM-057 rigid 29er
So, no.