Regardless of housing being a human right, the space used has to exist, materials have to be used to make or upkeep the structure, and it has to be prevented from decaying to the point it can no longer be habitable.
Building and upkeeping these spaces requires expenditure of resources (building materials, time, work effort). Where is that supposed to come from? Whatever source for these resources exists has to get them from somewhere, and if you don’t expect to have to help upkeep their ability to provide these resources over time, someone else would have to.
There’s no way to magic these resources out of thin air. Even without the grim specter of Capitalism, the wood and nails have to come from somewhere, and someone has to put it together. Someone has to keep it from falling apart.
Any further discussion boils down to: Do you accept the responsibility of contributing your fair share, or do you expect someone else to subsidize your fair share in some way to make up for what you can’t or won’t contribute?
I’m not making any judgement one way or the other, just saying that there is no social/political system in which you can make something out of nothing. Some people are going to over simplify that, but it’s a valid question. Where are these things supposed to come from when someone can’t provide it for themselves? Who should be made responsible?
I don’t have the answers, but calling the expectation that others provide it for you “stealing or slavery” isn’t an absolutely absurd leap.