Chat went like this:

Her: send a pic of her cooking and says MasterChef

Me: You? Masterchef? I wouldn't let you cook me even once.

Her: Because?

Me: Because I said so.

Her: I have never cooked for you, you haven't tasted anything I've made.

Me: True. Just a gut feeling that you suck.

Her: Well I guess I suck at everything.

Instead of taking it as a challenge, she gets self conscious. What would be the right approach? The chat is translated from my languafe to English so not everything sounds perfect.