This reminds me of something I read a while ago online, about likes on an Instagram post. If you were to go out one day and one person complements you or your outfit, that one compliment would probably make your day. If you post something on Instagram and it gets 10 likes, you probably would be upset. At least most people would be.
Nowadays, people including myself, just randomly like posts on Instagram. Especially if they are posted by people I follow, I will like it without really paying attention to it. I despise snakes and if a celebrity I follow were to post their pet snake, I would probably like it and scroll away really quickly. But in real life if a friend were to show me a their snake, I would very obviously show that I do not like their snake.
Sometimes people online like things to just like things. Sometimes a post moved them, sometimes it did not. I think one sure way to tell is if they comment. I only comment if a post really moves me. Unless it is a friend's post on instagram in which case I will comment "so beautiful heart eyes emoji". 99.999% of the time, I do mean it but there are times when I don't.