I love 60s and 70s rock. I also enjoy plenty of modern acts, just not as much. The answer is that older is always better, and someone will always find a justification for why that rings true. With music, you've had decades to filter out the crap and look at only the gems of the decade. Most 60s and 70s fans will groan when you mention John Denver or the singer-songwriter movement in general (I like singer-songwriter music, but what was pushed in the 70s was the wussiest pap imaginable by and large). They will espouse the decade(s) anyways.
On a related note, the whole "autotune" thing annoys me. Not because I like autotune, and I don't, but because it's just a higher tech version of studio tricks from decades past. There were heavily engineered, manufactured pop acts as far back as the 50s, and people act like this is some sort of new phenomenon. So basically, it comes down to "the crappy pop acts of this generation have it easier than the crappy pop acts of my time." And they totally had to do it walking fifteen miles, through the snow, uphill, both ways.
On a related note, the whole "autotune" thing annoys me. Not because I like autotune, and I don't, but because it's just a higher tech version of studio tricks from decades past. There were heavily engineered, manufactured pop acts as far back as the 50s, and people act like this is some sort of new phenomenon. So basically, it comes down to "the crappy pop acts of this generation have it easier than the crappy pop acts of my time." And they totally had to do it walking fifteen miles, through the snow, uphill, both ways.