dhacker,
I am afraid you mistake my stab at humor. I can understand both why one would bring a child into coach/business/first, and exactly why one sitting in coach/business/first might not enjoy said experience (or with any other individual exhibiting behaviors generally defined as imposing).
Do I have any children? No. But I have enough close friends who do, and I find myself in situations whith their children often enought to realize that you are dealing with individuals, no matter how old or young, who will sometimes act on their own volition.
So what's the answer? Like everything else in life, whether love, work, amusement, education or basic socialization, the only thing one can count on is that situations will arise where one's patiences are tried.
Its how one reacts that is relevant, as that manifestation is what ultimately determines the final experience. And here again, whether on the giving end or the receiving end, you and the other individuals involved are oddy entwined, as there is no outcome except the one mutually derived.
How you evaluate, remember and are impacted by that experience is yours. Only you can make a positive out of a positive, neutral or negative experience.