crowd surfer

Someone who goes along with what is popular within a given group of people regardless of their own personal standings in order for general social validation to be achieved.

Dude, that kid is such a crowd surfer.
How?
The group he hangs out with doesn't particularly like him, but he still just goes along with whatever they say. It seems like he just wants to fit in, but he's just going about it the wrong way
Oh yeah, that makes sense.
You wanna make out?
Oh boy do I!