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Yeah, Bourgeois Bohemian comes out of nowhere in that example. It's also not listed in the work's trope list, and I think that's pretty telling as to its applicability. He's too young, not wealthy enough (IIRC), and as you said he doesn't have overt liberal traits. That portion of the example could probably be cut outright and the entry'd be fine.
Look at all that shiny stuff ain't they pretty

I found an entry for They Changed It, Now It Sucks! on the YMMV page for Spider-Man: Homecoming where it talks about how the movie got rid of some Peter's self-sufficient traits. I don't have much of a problem with that, but around the end of the entry it calls Peter a Bourgeois Bohemian and I have no idea if it's using the trope correctly,
I don't think this is a correct usage of Bourgeois Bohemian, as Peter is not upper-class and doesn't display the overt liberal traits that the trope requires. Is this shoehorning?