My point of view in this endless discussion that always comes up is this: In every third interview with bands who started before 1991 this point comes up and got mentioned (most of the times with a sentence: the change of styles in the 90ies...etc)

I would agree to the argument, bands like Trixter, Firehouse etc (you can make jokes about them, but the guys are STILL playing, making a living out of music -
which can not be said about any 3rd rate bands on the Sub-Pop label who are long forgotten) were actually better musicians and could play their instruments, had songs (instead of feedback orgys) chorusses and solos, that were suddenly "uncool" to have on songs!

Metro had a good point: It was not only the (later so called... for us it was just Rock'n'Roll!) "Hair bands" but also the whole Power Metal, Speed Metal, Thrash Metal and Heavy Metal AND Classic Hard Rock bands who suddenly were out of focus and wondered why not even 30% of the fans came to their shows as they did 1-2 years before!!
So it was absolutey not only Glam who disliked "Grunge". Bands such as Savatage, Jag Panzer, Vicius Rumors, Anvil etc. who continued their course, stayed true to themselves and got through the "depressive" years could tell a story (or would tell me back in the 90ies) how much they disliked absolute crap like TAD or Mudhoney or Babes in Toyland etc.

In all fairness there were a few interviews were bands mentioned, they did the damage themselves, but the change of climate was very fast.