After watching the video, and assuming the flypast was unbriefed and not fully conveyed to the other flight crew, I'm with the 'that was pretty poor' crowd.
It's funny how different the Cathay safety culture is from the RAAF.....in the recent past, Cathay captains have lost their command for inadvertent errors, yet this seemingly unbriefed and deliberate example of poor airmanship is 'unpunished' by the Cathay system.
In the RAAF, the reverse occurs....the inadvertent errors are generally debriefed, disseminated, and lessons are learnt with no resulting 'discipline', and the (very rare) deliberate breaking of rules is met with loss of category etc.
I guess it's a 'generational' thing, but I believe Cathay still has a way to go before they'll approach a true 'just' safety culture.