First off... who cares what someone else thinks about the things you have in your own home? It's your home, not theirs. And there are plenty of popular and successful adults who like displaying their toys. I hear it's almost mandatory for anyone who works for Disney and Pixar (like my school instructors).
Secondly, going off my own experiences involving total strangers who came to my house to set up my internet, help me move, or perform maintenance, and every one of them struck up a conversation with me about my stuff.
"This is a very interesting display! My wife collects those Precious Moments figurines. Can I take a picture to show her how we can display them?"
"Oh this is cool! I used to play games when I was a kid. I only recognize some of them. Where did you get them? I'd love a Pac-Man figure for my office."
"You like Nintendo stuff too? I love Zelda. I take it you do too. Got a favorite?"
Same thing with other random trinkets I have around the house, like a replica gunblade, some Gundam model kits, and my "Zelda shrine", along with a small retro room.
And even if these people - or even my friends - hated it or felt it was embarrassing, it doesn't bother me, nor should it. It's stuff I'm happy to have, happy to have in display, and it helps me be creative when doing art or game design.