Because he is not a typical white male? I'm sorry, but if it was that descriptor that tried to pull those same pranks many on GAF would be losing their shit. Treat as equals, it's a baited prank to try and fuel race/ethnicity/culture wars. No respect should be given for such pranks, regardless of who does them. I'm happy to see members from Muslim/Islam/Arabic-GAF call him out. All he does is further divides and in this case actually hurt himself with his past antics meaning he isn't getting instant benefit of the doubt.
The airline and passengers can be called out themselves when it's proven it's not this guy acting out again. It's looking like it may well be real this time, but he has dug his own grave of scepticism given his past. Hence how he HURTS perceptions and causes, not does them any favours with his videos.
Because he is a member of the ethnic group with which the stereotypes he plays off of. I would consider racist pranks the dudes who pay people to behave a certain way to continue a stereotype.