there was not always generational animosity between millennials and boomers
There is currently a completely understandable sentiment among gen z that millennials, collectively speaking, hate their parents and blame them for a lot of stuff. This was not at all the case in the 90s and even early 2000s. What gen z is witnessing is the result of the growing animosity that millennials have had toward boomers starting around the financial crisis in the late 2000s.
The 90s was extremely respectful and grateful towards boomer culture. Grunge music was basically a revival of the 60s hippie era, just with less hopeless idealism an naivety. Gen Z grew up thinking that big music festivals were always a thing, while they did exist in the post woodstock era, they saw a major resurgence in the 90s with woodstock 94/99, which people for some reason now think were disasters but I remember very clearly at the time were thought of pretty highly. There were the expected issues people had with the commercialization of the festival, but the only people that seemed to focus entirely on the destruction and sexual assaults was the media. The whole "woodstock 94/99 were disasters" thing is total historical revisionism.
The whole "ok boomer" thing was not even remotely a big cultural thing back then. People obviously had issues with their parents as they always do, but it was not in any way this big cultural thing. Climate change was only really talked about in educated circles, there was significant economic prosperity with the dot com boom, there was like 1 noteworthy mass shooting, the crime wave of the crack epidemic began to significantly decline, the gulf war was a major military victory, no one ever talked about israel...... no one was really sitting around blaming boomers in any serious capacity for anything. Gen x thought they were lame and out of touch, but that's all it was they didn't villianize them to any serious degree.
then came the financial crisis, inaction on the debt, the climate change debate, skyrocketing cost of housing and cost of living comparative to wages... all sorts of shit.
so don't do the "LOL everyone hates their parents", the record is very clear and documented that this has been a recent thing