Whats a controversial opinion you have that doesnt have to do with manga/manhwa?

Being childish is totally okay no matter what age you're at.
I'm talking about stuff like collecting dolls, playing games, enjoying these silly little chemistry play sets or lego, or dressing up in cutsey outfits.
It is more accepted nowadays already but I still do not vibe with how negative it had to be to begin with (especially when so many men seem so into women who look as young/youthful as possible). This dumb, irrational need to let go of what I simply consider fun for... "serious?" adulthood business, whatever that is anyway.
Many older generations act like it's one of the great sins, like you can't hoard Hello Kitty merch without being a perfectly responsible adult and it's like...? How is that different from collecting baseball cards for example?

...Which ofc leads into broader discussions of how society tends to force us to grow out of fun, to hide our passion, sexuality and so much more for the sake of being "normal" adults. Kill me now.