I’m autistic and I find showers overwhelming because they’re loud and they are touching you all over, it’s definitely a real thing but between unscented options, wipes and product choices like, spray deodorant for example, it’s still very possible to be hygienic and not “smell natural” if a person has symptoms so bad they literally cannot tolerate cleaning themselves it should be treated like any other symptom that they’d need to stay away from people for and they should abstain from attending.