Follow for follow?

I understand “follow for follow” but I don’t support it. The whole idea behind social media is you get to choose who you interact with and support. Being able to choose is the point of social media; choose who to like, who to dislike, who to praise and who to block.

I received a message once from someone who had followed me and wanted to know why I didn’t follow back like I had broken some sort of rule. This is 2019, toughen up, please. If I like what you post, I’ll follow, simple as that.