The issue here is that you want to control how other people act.
If you want to have rules for you own behavior fine. I have no problem if you choose to not eat in a store before you have paid. After all, it is your life and your ability. I also have no problem if you choose to not hold hands with someone of the same gender, or if you choose, as a woman to not vote. But if anyone tries to force you to not vote or to not marry someone of another race, that is a completely different story. Eating food in the store is nowhere near as important, perhaps, but the principle is the same.
I do have a problem when you put your beliefs on other people. In that case I feel that people are entitled
to tell you to buzz off.
This is also an issue of respect for the fact that people are different. We have different ideas and different behaviors. We have the right to live our own lives and we have the responsibility to let people live theirs.
Sometimes our ideas of our rights contradict with someone else's ideas of their rights. The original example of a couple of kids playing with a ball in a store in a way that bothers you is a perfect example of this.
You could handle this is to talk to the other person involved in a respectful way about how the ball bouncing was affecting you. Being snide and bullying about it is disrespectful and especially unfair for an adult to do to a kid. I wonder how an adult would respond if a kid asked that question in the same tone of voice.
And it is completely wrong to lecture about about toys and stores when that has nothing to do with you.
If you were sitting behind my daughter in an airplane and accidentally kicking her seat, I would want my daughter to say something. But, I would expect her to say it respectfully. If she went on some kind of wild tantrum about how people shouldn't move feet in airplanes I would be disappointed.
But the point is this. You don't get to control what other people believe or how other people act. We are each entitled
to live our own lives in the way that seems best to us. Once you accept this, we will all be in a better mood.