You are still missing my point. I don't even care that the lady is eating her outside food at a table. I was referring to the overall idea that the "I don't care what others think of what I"m doing" is the larger problem.
If I and everyone else sees what you are doing (or that your kid is being a brat) , and think that it is discourteous, then guess what, it's discourteous. Other's opinions do matter when you are the only one with a counter opinion, because it is you they have an opinion about.
At what point does "I don't care what other's think" become discourteous? And if it does have the potential to escalate into a larger problem, why not make an attempt to cut it off at it's lowest point?
Furthermore, my OP addresses that it is the people who are taking up the tables simply because they want a place to relax, is the problem. It is their lack of courtesy, and their "I could careless attitude" that is the crux of the problem. I quoted the other lady because she happened to be the one who put the words out there. I was addressing that attitude, vice her behavior.