"Nothing wrong at all with lightweight."
I didn't suggest there was Dave

I know you didn't use that phrase, Jim, but you did say

they were so lightweight, I was out within two years.

and

The reest introduced people to a somewhat dumbed down form of folk song and never provided anything else.

It is that type of looking down on 'lightweights' that puts people off traditional folk at times. I know it may not be what you meant but both phrases come across as you believing that the type of music you like is superior to that provided by the popular acts. You may believe it is superior but that is purely a matter of taste. You should try to chose your language more carefully if you want to avoid unnecessary conflict.

DtG