"This is how all will know that you are my disciples, if you have love for one another.” John 13:35

As believers we have a duty to love. In the 21st century more people turn from the gospel because of Christians who are mean than any other reason, at least in the West.

Calling out the sins of other believers I think is an act of love. If this lady was a Christian neighbor of yours, then it MIGHT be appropriate to address gluttony with her. But as a picture of someone you don't know on the internet its is harmful to our mission of making disciples of all nations to speak ill of her. Particularly for someone who so publicly advertises himself as a Christian.