My question of “why should I have to listen to it?” was in response to your question: “Why not ask older parishioners how they feel about it? There opinion ought to count, shouldn’t it?” You made it sound that the older parishioners “feelings” are more important than anyone else’s including mine.
I really don’t believe your silly statements above are at all reverent during Mass and I did make it very clear in my previous posts that reverence is mandatory. Please go back and read them again for clarification. (Or better yet, just admit that your all-inclusive condemnation of playing guitars in Mass was wrong. It just depends on whether or not the music is done reverently.

)
The whole point is the guitars aren’t ever used reverently, which is what my comment about classical guitar referred to if you’d care to reread it.
My point about the kazoo rather strongly refutes your notion that it’s the music, not the instrument, which hurts reverence. There is no way to play kazoo reverently; try “Ave Maria” on it.
Folk and rock simply are not reverent forms. Neither is rap. Those who try to shoehorn such things into liturgy are more interested in the musical style than in worship.
It’s not a function of age, either. I happen to be some years younger than you are.
I believe it to be a function of irreverence, possibly because Baby Boomers as a whole tend to disdain reverence.
And yes, outside of Mass I do enjoy plenty of guitar-based music, especially blues, rock, and even a bit of folk.
Mass not being about my musical preferences, however, I leave them at the sanctuary door.
How nice it would be if those who insist upon the captive audience of the faithful to play their favored instrument would do the same, if only out of respect for older parishioners for whom it tends to ruin the reverence of worship, if not for Christ himself.
When I face Christ at the end, I rather doubt I’ll hear, “Great riff, thou good and faithful servant—Rock on!”
I cannot imagine power chording away in the presence of the Lord.
Some of course can—but they are wrong.