Yes, git did originally come from Linus and the Linux kernel development community. But since then, their original use of it has been eclipsed by the larger and more vocal GitHub/Ruby on Rails/JavaScript segment of software developers. The fact that both groups use git does not mean that they're otherwise connected in any way. Traits (such as the propensity to be a hipster) specific to one of the groups very likely do not apply to the other.
Many of these GitHub/Ruby on Rails/JavaScript people do advocate very loudly for git's use everywhere, even in situations where it is not the best choice, or even where it's obviously a bad choice. Some of them have elevated git from being a tool to a quasi-religion. They've done this with some of their other "chosen" tools, too, so it's not just limited to git.
They do make the git community as a whole look quite bad. But they're obviously very distinct and separate from the Linux kernel developers who created git. The two distinct groups should obviously not be confused.