I suspect there are actually good reasons for the disagreement here. I believe a large proportion (relative to the population) of people on LW have Asperger's Syndrome. Skin conditions and sensitivity are often comorbid symptoms of AS, so it would seem likely that the negative effects that soap can have would be more likely to show up in $RandomLessWronger than $RandomPerson. In my own case, most soaps and deodorants irritate my skin enormously, but I've found particular ones that don't, and I use very little of them to be on the safe side, while still using enough to keep myself clean and non-stinking.