"Sure" as a response

Hi. I'm writing a script and would like to know if I have used "sure" correctly in these three examples.

Example 1:

A: I painted it myself. You like it?

B: ...Sure.

- Would the ambiguity of sure be perfect here if B doesn't like the painting, but lies about it though not convincingly?

Example 2:

A: You could come over tomorrow. Then you could meet him.

B: ...Sure.

- Would sure be perfect here to politely imply reluctance and disinterest?

Example 3:

A: We didn't talk about you.

B: Sure.

- Would sure be perfect here to imply that B doesn't believe they didn't talk about him (with the right intonation of course)?