How to answer tactfully when others say you are a pig?

If the other person is a man and you like him, then the title of pig has a nickname. I think the other person called you a pig, but you secretly rejoiced because he already regarded you as one of his own. Close classmates will give each other nicknames. I think this is the embodiment of normal classmates' relationship, and there is no need to be too entangled. Honestly, you can't resist.