I really loathe anyone who is sure they know just what everyone else needs, particularly if they don't even know them at all. There are no "one size fits all" fixes for anything in life, because people are complex, varied, and individual.

Besides all the very obvious ways that something as stupid as an all meat diet would be bad for anyone's body long term (cholesterol, burdens the kidneys and liver, etc) this woman really was obnoxious.

Hang in there...