A lot of us are not from a different generation to you though. Do you think most of us lived through or have big memories of Anfield 89? Of course not. But we appreciate how big a moment that was all the same. We’re aware of how our club were viewed before we were there to witness it. Whereas you were coming across as if you had absolutely no idea and seemed quite dismissive of the club pre-Wenger.
It comes across as ignorant. It’s not about being 21, and saying things like “when at 21” to try and put all young people in the same category as you is an insult to others. My 18 year old cousin for example has been going to Arsenal since he was a wee nipper, he can hold his own in any conversation about Arsenal and all football in general, probably more so than a lot of older fans actually - he’d be embarrassed at the way you were talking.