Glass and lenses fog up when the temp and humidity on one side is vastly different than on the other. Things like sealed binoculars, house windows or a cup of ice water get foggy in humid conditions. Binoculars fog when they quickly go from a crisp dry cool climate like inside a well air conditioned house to a warm muggy climate, like outside in Louisiana summer atmosphere. AFAIK pistol red dot sights are single panes of glass, so the air is the same on either side of the sight with no sealed air in between two panes like on scopes or binos.
If being carried close to your body, even OWB is close enough, I don't think a fogged lens on an RMR would be an issue. Not saying it couldn't happen though.
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