That happens cuz your taste in media, story delivery etc got more developed and refined the older you got and the more life experience you got.
I used to think the show Final Fantasy Unlimited was cool, but when I re watched it as an adult, I got upset that the summoning scenes was constantly replicated and repeated per episode. Like I get that the show wasn't meant to be binged cuz it was made for 1 TV episode per week and that 2D Animation back then was very hard to do, but still. This is also probably the reason I don't like other Anime with the same repeated transformation or summoning animation scenes much these days. It bores me easily now, so often I skip those scenes just to get to the rest of the show ^.^
I also used to think the anime Ghost Stories was interesting - but at the time I viewed it in Spanish. When I watched it in English as an adult, I was horrified and disturbed. I can't tell if that was the real dub or if it was a troll who stole the show to trash it as much as possible for whatever reason. Ended up hating the anime because of the English dubbing. It wasn't funny at all.