Shhhhh. You're just getting old. Accept it. We're all getting old.

Remember the South Park episode where music started to sound like literal shit? That was possibly the most accurate episode of anything, ever.

All humans lack the ability to objectively analyze music that has been produced after they attain roughly 34 years of age. New music is bad, the music from your era is good.

It's just feelings. You're just associating positive nostalgia for your own youth with the sounds you were hearing, at the time. That's all it is. If you rigidly refuse to ever complain about new music, people will think you're cool. You'll still internally think new music is shitty, but you can choose to hide it.