I am the proud father of two boys (6 and 12 years old), What annoys me more than anything is those people who complain about kids and yet put themselves in positions where they are almost sure to come across them.
Example; we took the boys to a family themed restaurant at 6 in the evening last weekend. In that restaurant, at the next table, were a couple (no children) who were clearly displeased at our children talking (not shouting or being naughty, just talking). Well. I'm sorry, but if you get annoyed by kids, do not go to a family restaurant in the early evening - go out after 9, or go to an adults only restaurant - jeez!