Why do so many people suddenly think it's acceptable to continue to live with their parents into adulthood?

The end of 2011, beginning of 2012 I became divorced and was losing everything, including my home. My mom and brother moved out not wanting to be in the middle of my messy divorce. It’s a very long story as to why I didn’t get anything from the divorce except my personal belongings like clothes and make-up, but we won’t get into that right now. Just know that the divorce literally took everything I had, including my job. I was left with only heartache. The only place to go was to my mother’s where she and my brother had rented an apartment, and though it only has 2 bedrooms, we made it work, and we still continue to make it work.

I honestly don’t care what people have to say about me living with my mom and brother. These 2 people have always been there for me, and unless you’re willing to pay my bills, there’s nothing more to be said.

Me and my mother - cheers!

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Fast forward to me, my husband (now ex) and son moving to Florida in 2001, where I asked my mom to move with us. It took her a few months to wrap up her life in California, but she arrived 3 months after we did, bringing my adult brother with her. We all lived together in a big house and things were great.

My viewpoint is I’d have to have a roommate if I moved out on my own anyways. Rent in my state is rather high and my income would barely cover a months rent and utilities on top of my already standing bills. There’s just no way I could afford to live alone, and why would I roll the dice hoping for a decent roommate when I already know my mother’s habits (as well as my brother’s) and I know I can rely on them. Why would I put myself in the position of someone not paying their portion leaving me stuck to foot their bill, too? Or eating my food? Or using my stuff?

After I graduated high school, my mother moved out of the apartment she rented leaving me to pay the rent and moved almost 2 hours away from our hometown. I didn’t see her except for Christmas for several years after that. I had 2 friends move in to help cover costs, so it wasn’t too much of a burden on me. Unfortunately, one roommate was always late with her share.

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Why is it not acceptable?