i feel like if you're living at home and helping out or stacking money for a goal or plan then nothing is wrong with it. i moved out and had roommates and it was a terrible experience. ever since i got a job in berkeley, ca 2 years ago, i moved back in with my mom since she only lives 15 minutes away from where i work and the peace of mind i now have has been worth it.
personally, i could never freeload off of anyone so i give her 800$ a month and save everything else. it can get annoying at times since she has silly rules i have to follow, but the stress of not having to deal with a roommate and being able to save money is nice. i'm planning on buying a condo next year and couldn't have done it without having the option to move back with my mom.