No children do not come first! Especially in a signature restaurant. Rude behavior is not acceptable whether it be child or adult.
I stick by well behaved children are welcome everywhere
If a child cannot handle a signature dining experience then they should dine in a more appropriate venue
I've said it time and again - it's not the children I worry about, it's the so-called adults.
How about you define RUDE?
The nuance of what is appropriate versus rude is endless.
Should children be denied being able to travel on trains & airplanes or just the rude ones? Should the limitation be no children in 1st-Class?
But what to do with rude adults?
Disney repeatedly
reminds adults about what is or is not appropriate dining room attire, and yet, there are countless threads on these Boards with adults attempting to figure out how to 'break those rules'. Should Disney enforce the dress code at Disney Signatures if Signatures are to actually be, well, Signature experiences?
Is it rude when people wear Park clothes to a Signature dining room and diminish the fine dining ambiance? Should people in tshirts (because they willfully ignored the written policy) be refused service at Disney Signatures any more than your determination about what is or is not a well-behaved child?
So let's play by your rule - behavior. Was it OK, in your view, for the child (I witnessed) at CA Grill to be sleeping on the floor of the restaurant in anticipation of late-starting fireworks? Is that well-behaved child impacting my Signature meal any more than a toddler repeatedly dropping their spoon on the floor? Was it appropriate or rude of the adults to drag their child out past their bedtime (with woobie & pillow) to enjoy some fireworks?
Similarly, should people who wear too much perfume or cologne be refused service at restaurants - their smell is offensive to those of us trying to enjoy a Signature meal. How about smokers who don't wash before returning to the dining room? How about the adult who is too vain to wear a hearing aid and shouts for all the dining room to hear? How about large groups - they make more noise than a couple trying to celebrate with a quiet meal? Should the Politeness Police have them removed for being rude to the other patrons for nothing more than not meeting your expectation(s)?
The RUDEST experiences I have ever witnessed at the thousands of meals I have had inside a restaurant were caused by adults. I expect children to be children, on the other hand, I have had more experiences negatively impacted by adults - and rude adults are allowed to eat.