Whether you'd lower yourself enough to go to a proper concert isn't my concern.
My point is that there is such a thing as 'gig etiquette'. And rule Numero Uno is that you treat other audience members with a modicum of respect. If those girls were at the front they got that position fair and square. Pushing and shoving other people around in order to get a better position is just wrong.
If you'd been to as many gigs (and I mean
proper gigs - none of that fucking pop music shite where everyone is sitting in rows and rows of clearly marked seats
) as I have then you'd understand the do's and don't's. It's easy to spot posers at gigs cos they're always the ones pushing and shoving and acting silly.