I'm actually not being hostile, I genuinely found your round-up of 90s music funny because it was like one of those "Remember the 90s!" Time Life things
I think you're missing out on rap and hip hop.
And I wasn't offended by the Neil Young clip, I actually found it funny, but it perfectly demonstrated your prejudice against him. My suggestion would be to go see him live, because the atmosphere and energy of a concert is a far more convincing thing than any youtube clip.
And The Flaming Lips are a very popular, Grammy Award winning alternative band. They recorded, what many believe, is one of the best albums this decade Yoshimi Battles The Pink Robots, although I think their previous effort, The Soft Bulletin is superior (and Entertainment Weekly agree with me - they named it the 23rd greatest album of the last 25 years). I don't think you'll like it too much though because Wayne Coyne isn't the greatest singer!