I think that you should send out an email with a subject something like, "They assumed my..." and tell this whole story. Opening line: They assumed my vax status (and my preference in partners. Maybe I should let my wife know the news...) Maybe wrap it up with, "if you, too, want to write emails that get absurd signups like this (and fungolas in your bank account), then, check out this course (product, etc.). This is too absurd and funny not to share outside of the group.