Actually, knowing who it is would lead the asshole I am to say something to him, if I saw it:

"Hey, you know, there's a very active homebrewing contingent in and around Davis Square ... and they talk to each other. If you want to continue to treat female customers like they're idiots, everyone will learn about it, and take their business elsewhere, after notifying the owner of your behaviour, and its consequences."

But, as we all know, I can be a serious dick.