If someone calls you “Einstein”, it’s probably not meant as a compliment, it’s sarcasm. It’s like calling you a clever clogs, or smart ass.
[A guy is in the middle of painting a front porch and someone walks up to him.]
Unknown guy: So, you’re doing a little painting huh?
Painter: That’s right Einstein. What tipped you off? I mean, I’ve been trying so hard to keep it a secret here. Hey Einstein?
Einstein: Look, not everything that comes out of my mouth is the theory of relativity. So can the sarcasm!
Painter: Sorry, did I hurt your genius feelings?
Einstein: Walk away, walk away… you’re the genius, he’s the painter. You figure things out, he paints things up. You’re clearly the winner here.