Jaskier has come across many critics since his youth, but Geralt isn't offering criticism - he's outright insulting him. Geralt isn't wrong about the easily bruised ego, though, because one the things that is bothering Jaskier the most is how unfazed the man looks, as if Jaskier's hurt feelings didn't matter at all.

Pay attention to me! SEE me!

He isn't pouting. No, really, he isn't.

Except he totally is.

"That's not a review, that's a bloody attack! I know for a fact I'm a good singer - it's my talent that is paying your service today, Mr Tactless Brute!" Jaskier comes closer to poke at Geralt's chest which-- fuck. So firm. Wait, no, no distractions, he's supposed to be insulted, not horny. "What would your daughter say if she heard you talk like this about her musical taste!"

Maybe a low blow, but he can't help it, he's feeling rather petty right now.