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Sounds like nonsense. Blue sharks are non aggressive and don't kill people.
Actually they do, although they are not a major factor in fatal attacks. Check out the International Shark Attack File stats at Species Implicated in Attacks
Although other species like great whites and tigers are way up there in the stats, blue shark attacks exceeded those by oceanic white tips.
The problem with tallying up attacks by blues and oceanic whitetips is that those are pelagic species; it's somewhat rare for either to come into areas where recreational swimmers/surfers (the primary demographic for recorded shark attacks) are...
I have yet to encounter either species, but from secondhand information blues aren't nearly as bold as oceanic whitetips.