I did this yesterday, its just a tease. Saying 'you remind me of xyz' is not just physical appearance but an attempt to describe the vibe of their personality. From a girl its a form of teasing shit test, testing your value. Be unreactive and playful no matter who they say you remind them of.

'You remind me of Shrek because you look like him haha' its an IOI 'Awesome high five! you remind me of Donkey...because ur fun. You dont look like a donkey. I would never say that to you. come on, would I? hahaha'