I'm the grandparent poster it was directed to, and I see it as a perfectly acceptable and correct thing to say given the context; if you feel the need to get offended on my account by taking it out context, it's a free world! :)

FWIW, my perspective: In context, I have implicitly stated my goal of self-protection and even indicated my awareness that beard is counter-productive. Saying N95's effectiveness would be improved by dropping the beard is merely factual and restating what I already said. I certainly don't find it an "unbelievable" statement :)

Or how quick to take offence to fairly benign statements a certain type of person is.

You're misreading that comment. "Better" refers to how well the mask functions at blocking the virus, not to a moral judgment that beards are sinful.