This is one of those "debates" that are always going to remain unresolved.
Here's the thing. Whether someone uses a washcloth, a loofah, or just their hands alone, people who shower with soap (or some substitute) will get clean. How one goes about doing that will depend on one's upbringing and culture. Yes, things like loofahs and washcloths have the potential to be misused and might not be great for some people with more sensitive skin, but for the most part, they will not do harm (or people wouldn't use it). For people who use bar soaps in particular, it makes a lot more sense, and even makes it economically smart for multiple people to be able to use the same bar. For people who only use their hands, your skin naturally exfoliates (though there are cases where manual exfoliation is helpful) and the soap (usually liquid) will take care of bacteria (though there are many helpful bacteria on the skin's surface you don't want to get rid of, either).
Every culture has routines or practices that might be out of comfort or not be suited to every context, but people need to reign in their ethnocentrism sometimes. So while calling people nasty isn't surprising, it's very short-sighted and lacks some needed self-reflection (because lord knows our world needs it). Step out of your well-lathered, soapy-ass bubbles.