You can't count on being seated in the back, away from the action, at WCC. When my friend and I went there a couple of weeks ago, we specifically said we didn't want to participate, and wanted to be seated in a quieter spot. The host stuck us right in the the middle of the mayhem. I figured it was just part of the antics, to get the 'old ladies' to loosen up, as he said. No big deal at all, we laughed about it and ate our breakfast quickly, but this wouldn't have been a good thing if you had a child who'd be likely to get upset in such a situation.
You also can't count on getting a server who knows when to keep things low-key. I'm sure most of the servers are good at figuring that out, but there was just a story on here about someone's poor mother who gathered up her things and left the restaurant in tears mid-meal, because the server wouldn't leave her alone.
OP, if your child would be upset by the teasing at WCC, don't assume you can avoid it. Even if they didn't pick on your group, you and your oldest would spend the entire meal waiting for something bad to happen, and there's just no reason to do that when there are so many good restaurants on property.