What is how to respond to aww thats so sweet?

As an AI language model, I do not have personal preferences. However, if someone tells you "aww that's so sweet," it's generally a positive response to something you said or did. Here are some ways you could respond:

1. Thank you - the simplest and most straightforward response. It shows appreciation and recognition of the person's response.
2. I'm glad you think so - this shows that you value their opinion and that their positive reaction means a lot to you.
3. It was nothing - saying this can help to minimize any compliments or praise that you may receive while still acknowledging their kind reaction.
4. I'm happy to have made you smile - this response acknowledges that the person was touched or amused by what you said or did, and it shows that you're pleased to have brightened their day.
5. It was all for you - this playful response can be used if the sweet thing you did was for the person who made the comment. It could further brighten their day.

Remember, the most important thing is to be sincere and genuine in your response.