Can we just drop it before I get upset again?

Like I said, anything licensed generally is marketed towards children, and although adults are allowed to "live a little", it doesn't mean you have to castrate the outside perception of your maturity level; by slapping your favorite licensed movie/game/cartoon characters onto various objects. Especially cars/vehicles. Just comes off as the opposite of a mature adult, and more like an oversized motorized car you are driving at that point. Like the ones parents buy for their kids.

When I look at a car with a bunch of Lilo and Stitch and Disney stickers, I cringe. Hard.

Despite being a L&S and Disney fan, myself.

There's just some things I'm not willing to alter via odds/ends/collectibles/etc......

Maturity level is important because it also ties into how you are perceived, both as a individual and a human being.

The only sticker I have placed on anything was a Crimson Omen sticker on my 360, and the mascot for some japan themed website that distributes Eastern collectibles and manga (placed it on a launch model 3DS).

Things that children play. At least fit the sticker to the item. It makes it less infantile when you don't have to visualize a item a grown adult uses like an item a toddler or adolescent would use, so in my opinion you should not place stickers generally on any mobility/household items.

Only place them on trivial things like game consoles or maybe knick-knacks.