Most people who are arguing that being a landlord (as a class) are arguing that using property (ownership) as an investment (extracting value) is evil by it’s nature. By owning the home and living there, there is already a categorical difference. Most (although not all) people arguing against rentier behavior have no issues with a person owning personal property.

I do see your what you are trying to say, it’s akin to “slippery slope” falacy en.wikipedia.org/wiki/Slippery_slope

If landlords are wrong, then logically wouldn’t this other more reasonable and less exploitative thing be wrong too? (renting a room in a house you own and are living in)

Or maybe not. Maybe renting out a room in a house you live in is wrong too. Frankly, it would be simpler to do away with all private property rights, and live in a star trek style egalitarian utopia. I would vote for that.

As long as I get to smuggle in some Romulan Ale.