You can interact with them on their posts so yes, you’re able to interact with them like this. Are you interested in them? Do you value them? Apparently they don’t necessarily value you that much – I tend to actually look at my feed. So if people are posting things I don’t like I unfollow. I think not all people work it like that – some people follow like a thousand accounts – your posts would get lost in a feed like that anyway. Not getting seen.