There seems to have been a rise of late, but this is pretty tame. During Big Brother, I had people insult me, my family, my pets, my dentist, and my third grade teacher because I didn't think Janelle was perfect (repeatedly).
Nintendo's pretty much accepted and embraced their kiddy image, much like Disney. It's not the worst thing in the world. It gives them a niche that can't be easily wrestled away.