User hostile? If displaying liked content to friends increases engagement, what's wrong about that? What would a feed that wasn't optimized for engagement look like? Facebook would already be a dinosaur in that case. People go to Facebook to see the most relevant and engaging content, what your friends like seems like a great source for this!
it's user-hostile insofar as no one wants their likes showing up in their friends' feeds. from a consumption point of view it makes little difference; you see content and interact with it. note that there is absolutely no way to opt out of this feature.
