Its not very nice that the author turns a 'security researcher' (his words) who is effectively helping (if not actually doing) the authors job for him into a pantomime villain.
[edit: I do get that they became 'friends', which gives some levity to these descriptions, but it still strikes me as casting aspersions not just on the individual but more generally on the way he and others like choose to work]
If you read it all the way down, the author reveals that he befriended the hacker and was very grateful for helping and co-operating with the fix. The villain part in the beginning was just joking, although I did not particularly enjoy that style of writing either.
Considering the think layer of sarcasm above, it's pretty clear the booing was joke as well. Same thing for sitting with crossed arms on the front row while everyone else cheered at the jackpot demonstration.
I thought it was part of who the author is. He doesn't strike me as a particularly serious person, so booing the security researched who has become a "star" of Black Hat in the eyes of the rest of the applauding audience sounds like a funny and friendly thing to do to me.
[edit: I do get that they became 'friends', which gives some levity to these descriptions, but it still strikes me as casting aspersions not just on the individual but more generally on the way he and others like choose to work]