Wikipedia makes it sound like it's just edgy rage bait:

"Little Girls" was written by Danny Elfman after reading an article in a newspaper.[2] The song was written as a satire and has a strong punk rock influence, as well as a horn arrangement. When asked about the song's darkly humorous lyrics in 2010, Elfman replied:

'''What made me write it? At that point I was just grabbing onto things that popped up in my head and taking characters and singing from their point of view. ... So it didn't necessarily reflect me...but it was just fun and I knew it was irreverent. I was out to offend everybody.[3]'''

Elfman would reiterate this view in 2014, claiming that the song was an "in-your-face facetious jab."[2][3] Elfman has occasionally offered other explanations; in a 1985 concert he jokingly suggested that the song was about how his girlfriend was so "very, very little" that "she fits in the palm of [his] hand."[4][better source needed]

"Little Girls" was described by Creative Loafing Tampa as one of the standout tracks of Only a Lad.[5]

That doesn't really excuse it. I also remember songs sexualizing younger women. At the end of the day, our sexuality is imprinted on us by the culture around us, and that's what was being imprinted on the people who were alive at this time.