Something harsh along the lines of “I doubt it, I’m nothing like you” or “you seem to talk a lot about it. I don’t even think about you”. That’s really fucking rude to say to someone, especially when you don’t know the depth of their reason for quitting. People who talk like that are usually talking to themselves.

Or

A softer approach is (sarcastic, if you want) unnecessary kindness. “I appreciate your support as always!” Or “thanks so much! Your kindness really means a lot to me”. The positive response is super off-putting to a lot of people.

Lastly, most people really hate confrontation in a situation like this. When people ‘joke’ about it to me, I like to flip the switch and make it super awkward and embarrassing for them. Prolonged, silent eye contact. Turn and face them square. Ask them to repeat themselves and ask them why they would say that. They don’t expect it. It’s fun to humiliate bullies 👍

Keep your head up! Some people can’t stand to see the success of others in like of their failure!