Complaints can be categorised into 2 groups, things you can change and things you can’t change.
If you are able to sort the issue that feel the need to complain about, it’s probably not worth the effort to complain. Instead take action, do something about it.
Lets say that you’re cold. You could fix this by putting on another layer or closing the window. But instead you choose to complain. Maybe you’re usually the one that has to close the window and you want someone else to do it for a change.
If you can easily fix something that bothers you and you choose to do nothing then maybe you don’t actually care, maybe you just like complaining. I think that can be a difficult thing to admit but it’s the truth for many people even if it’s just for something small.
And sometimes the case is that you care but you want someone else to fix the problem. Perhaps you feel like it’s always on you.
However, as much as that’s understandable, it is also of very little benefit to you.