I feel ya mate, just yesterday I was at a grocery store buying some food and at the check out I had someone else's kid come up to my leg and start pulling on my pants while the child's mother (around 19-20 maybe) was talking on her iphone whatever the f*#k. So I turned around and smiled at the kid and looked at the mother like "could you come get your child", the mother just looked at me and went back to her text and then the kid started to drool, slobber, practically started eating my pants and these were like $150-200 suit pants I use for work.
Now I am a very passive aggressive guy, it takes a lot, and I mean a lot to anger me and I handled the situation by taking hold of the child's arm (not in an aggressive way or anything) and walked the child to the mother in which the mother replied "take your hands of my son" in a loud, disrespectful, piece of s*#t tone. Now hows that for god damn inconsiderate, disrespectful and just plain retarded.
Some people just have no idea that the world does not revolve around them.