The thing is, Percy knows she's right. He's pretty much been a jerk all day, for all that he's tried his best not to take it out on her. But he's so caught up in his fears and worries right now that he can't focus on the part of him that usually makes him step back, apologise and ultimately go to her for comfort rather than whatever this is. Instead, he gets defensive.

"I've been a little preoccupied! You're the one who wants space all the time, I thought maybe you'd get the hint."

Beautiful sacrifices to wake the goddess.

Whenever they do finally get to Tartarus, he's going to murder that spider through the voicebox.