Perhaps because they believed they were doing a water fast? Because many people, not on this board, consider Water Fasting to begin with water consumption only but not excluding supports such as their prescription medication (for now, I am one of these people). Some people take salt supplements and consider themselves on a water fast.
I think that, when somebody has just disclosed that they suffer from anxiety, treating their reach-out for help with ridicule is deplorable behavior. Would you prefer this person retreat back into their fear and shame and not heal?
It’s not fair to suggest it was only your comments that were offensive. There was a theme. I refer to the name of this site and ask you to reflect that the people who come here are in pain and in need. Perhaps they are not as educated as yourself. Be kind. You can afford to.