Some breeder on TMC was bragging how she took her 3-year-old to a KISS concert. Talk about bad manners as well as bad taste (sorry for those KISS fans I've offended).
I also don't think taking children to rock concerts is good for them, just from the standpoint of stimuli (too noisy, too many people, etc.).
I think concert managers should turn away these dumbass parents who bring children to venues that are obviously not age-appropriate.