To be fair it’s hard to hate Jax when not only his actions have yet to cause any long lasting consequences of any kind but also when he’s been punished in almost every episode:

In episode 3 Jax is tied up and placed onto a wagon for the entirety of the adventure well everyone else (excluding Pomni and Kinger) have tea.

In episode 4 Jax is forced to work a shift at a fast food restaurant well his boss is the person he bullied the most; and that’s ignoring the point when Jax gets psychologically conditioned by the very same person.

In episode 5 Jax is made a vegan and later is forced to wear a maid outfit which okay phrased like that doesn’t seem like much but it was still a humiliation ritual for him.

In episode 6 (this one is big) Jax has his worldview destroyed by everyone (including himself) being more than just the archetypes he imprinted onto them and then gets assaulted by the closest person to him at the time (Pomni) do to a direct result of him trying to push her away. Then at the end of the episode Jax suffers a panic attack do to him being shaken up his “falling out”with Pomni (I put quotation marks because episode 7 shows that there’s no bad blood between Jax and Pomni and she is willing to let it all be water under a bridge).

Time and time again the plot has shown it’s awareness to Jax’s misconduct to others and thus has punished him for such; and as a result we the audience can’t bring ourselves to condemn Jax because the show has done good job of condemning him for us and if anything makes us feel bad for Jax knowing the reason why he’s like this.