I can answer this from the perspective of having a SIL that is a failed DN.

It’s because she shows up expecting to stay at my place for free disrupting our schedule and eating all our food while she figures out who she can mooch off of next.

She is homeless because she doesn’t want to pay for a place while traveling but she always wants to crash at our place when she needs to or she’s deciding where to go next. So, she wants it both ways which is bullshit.

By all means, live your life however you what but when it affects my life you can fuck off.

I don’t go to work to provide a crash pad for someone else.