Agreed! Everyone gave up trying honestly: just be distorted, punchy and snarl your lip but forget trying to explore the guitar past the first 12 frets. Basically just banging out standard chords quickly, not unlike Punk but more palatable to the masses I guess you could say.
I'm mostly referring to the post Grunge bands, circa 94 and up. Nirvana was the only band in Grunge that honestly couldn't play worth a damn in my opinion. The other big acts of the time such as Alice In Chains, Soundgarden, Pearl Jam and even Stone Temple Pilots could actually play and do it pretty well. Lots of talented guitarists in those groups with a great sound I felt
It was in the post era that a slew of bands like Green Day and Blink 182 you mentioned, but also nearly every other act leading on thru to the Nu Metal era that said "Screw it" and lead a lot kids to not care about actually learning to play the guitar with any real effort either. Only a few rare examples in the mainstream that were exceptions at that time, were TOOL and in fairness, Rage Against the Machine, being some of the few saviors of guitar, albeit in unorthodox methods but still appealing.
You gotta remember that this was supposed to be MY generation of music we're talking here and I felt like a complete outcast for the most part starting out against other kids I knew who played. They all flooded to that style and image and I couldn't feel further away from it if I tried. I began seeking out anything "older" and forgotten to try something radically different than what they were doing.
Fortunately, I felt the first breath of fresh air came right on the heels of Nu Metal's death kneel ( roughly 2004) in the form of what some call The New Wave of American Heavy Metal. It ran parallel to the Swedish Melodic Death Metal movement, where you had very technical and polished guitar sounds, reinvigorated soloing but more than that: harmonized guitars. It harkened back to the NWOBHM but modernized. Lots of kids began picking up with this movement and gave the guitar a much needed pick me up