There are two factors that most easily factor in to a quickban:It is a pretty sinister trick against a stall team, though, and doesn't add anything to AAA...
The people that faced this set were incredibly salty about it... Let me ask you something. How many of those Normalize Gengars used Mean Look first?
If you're slower and are not using a move to switch yourself out the turn Gengar traps you, you literally have to faint. We haven't properly defined Normalize Gengar... until now, where it holds the same role as the similar Mega Gengar. Even the existence of this on the opposing team can make your opponent act differently, which can be used and abused. There are certainly ways to deal with it, but the tools that AAA has when compared to something like BH are much more limited to deal with gimmicks such as this. Hence my reaction to this being so severe right off the bat.... I'm certainly open to counterarguments supporting this.
•Does it eliminate skill and tactics in favor of dumb luck? (especially luck in unbalanced favor to the player)
•Is the ban candidate in question simply too versatile to plan for?
As annoying as normalize skill swapper ghosts are, the list of users are pretty finite, and as was said before, folks have successfully dealt with it in past gen AAA. I know I found poison heal annoying AF, but its safe to assume that if it existed in the past, there's ways around it.
Here's the gen6 AAA OP for some good details: http://www.smogon.com/forums/threads/almost-any-ability.3528058/
As for counters, I'd not really worry about it unless it became that common in the meta. Just take the hit and keep playing.
Off the top of my head, here's some counters:
•Trick Ring Target
•Dark types (trapping nerf)
•Uturn/volt switch/baton pass
(May I suggest keeping Red Card on a slow pokemon with Stakeout?)
•outright kill them before they can use Skill Swap (If you're fast, you'll get two licks on 'em)
•Switch out before they use Mean Look
Also, if you have a kinda cheap strategy and don't want people to be salty about it, try just being nice. A friendly comment on their pokemon nicknames or that you like their mono-X team or whatever. And offer counters if they're annoyed.
I'm not accusing you of being nasty, but I know I had to take a step back and not start fussing for a quickban after a bad first encounter with a Poison Heal wall, and the user kept insulting my strats. I was preeeety salty. But I try to keep that part to myself. :x