Alot of sections close to the game at USMNT games are designated for that, if you don't like it, don't buy a seat there. I always make sure to buy those tickets so I can stand and sing.[...]
The last one I attended (at RFK vs Costa Rica some years back) they were doing it in more than just the front rows. Actually I might have been able to avoid it had I gotten my regular DC United season ticket seat (section 208) but something went haywire with their online ordering form and I never was able to get through.
I get my footie fix nowadays taking in Chelsea home matches on my annual London trips...it's all good now.