This is not a bad beat.

Ok I read the byline on this video and it claims

http://m.youtube.com/watch?v=sbE_-F3k9bA

to be a bad beat story of one AceKing flushing against another AceKing. One had the ace of clubs and the other had the ace of spades. The flop and turn made a flush. One player, Koroknai - a rather odious sneaky player- doubled up.

This is not a bad beat for several reasons. Both players four-bet shoved preflop knowing that they had two high cards in case the other had a pair. They both knew they were doubled suited and that was part of the thought process. They factored in the flush and straight outs into their play. They were 50% - 50 % before the flop. Most times it ends in a tie but even if they played the flop and saw 3 clubs would either lay down the hand?  I doubt it. So even on the turn both would have known they had a flush with the highest cards in the suit. Not knowing how high the flush of Koroknai was on the turn and with so many chips in the middle Ladouceur would not give up at that point.

A good play or bad play is based on how much information is available at the time of the decision.
That's the real factor: how much information was used and when it was applied.
This is not a bad beat.

A bad beat is when someone hangs around for a royal flush when they are drawing to one out. Knowing you are practically drawing dead and still playing and getting rewarded.  That's a bad beat.