What does the Dephox say?
Ring-ding-ding-di...
Whimsicott's reliance on Status and Support Moves may be Taunt bait, but it also makes you realize something new about Electric and Grass Types and Overcoat Ability they introduced in Gen VI - Electric Types are immune to Paralysis and Grass Types and Overcoat Ability Pokémon are immune to spore-based Moves. Plus, Gen VI gave us a new Hold Item that gives the holder the benefits of Overcoat Ability: Safety Goggles. Stun Spore, Cotton Spore, and useless-when-compared-to-Toxic Poison Powder just got screwed over.
Taunt bait isn't really a thing. People should stop using that phrase. Being weak to a certain move can be worked around. I mean people don't use Taunt for fun, they use it to shut down non-offensive supporter Pokemon. If you get Taunted switch out, no big deal.
Even less of an issue Whimsicott gets priority Taunt so it can shut down the Taunters first (except against Thundurus). It doesn't even matter if Whimsicott is hit by Taunt because it has priority status moves. Did your Pokemon just Taunt Whimsicott? That's fine because Whimsicott already Stun Spored your Pokemon and is now U-turning out. Or it used Encore / Memento and prevented the Taunt. Taunt does shut down the Sub-Seeder but Sub seeding is terrible anyway.