I started high school in 1998, so I think the popular alternative bands had shifted a little. I don't know if Smashing Pumpkins or Bush were popular here, but Creed definitely were. Weathered in particular. Otherwise it was the nu-metal bands of the time - Korn, Slipknot, Limp Bizkit, Disturbed, Linkin Park, Deftones, POD... along with more indie/rock bands like Hoobastank, Feeder, Papa Roach, Lostprophets, NOFX, etc.
Meanwhile I was listening to in Flames, Dark Tranquillity, Soilwork, Arch Enemy, Metallica, Megadeth, Dream Evil, Freedom Call, Dragonforce, Rhapsody, and so on. Basically I was on an island unto myself insofar as music was concerned during my high school years. It was probably only around 2004-ish that the 'scene' started to catch up in regards to MDM/Melodic Metal/Metalcore in the UK, and I have no idea if it was popular in high schools - only that at rock nights in the clubs around here I was suddenly hearing the likes of Cloud Connected, Trigger, TQP, Rejection Role, Nemesis... which was really cool for me, having had nobody offline to share my musical tastes with. Suddenly some of my friends were getting into more of the metal I listened to, a lot of them bought Come Clarity and they wanted to come to gigs with me and attend festivals like Bloodstock and Download. I wouldn't have imagined that to be likely in 2001/2002 when anyone who heard me listening to In Flames was like "lmaooo what's that satanist music"