User blog comment:Seinithil/Jason and Octavian/@comment-72.45.23.153-20111222220636

Octavian probably resents Jason because he was chosen to be a praetor and not him, plus Reyna prevented him from getting into Senate on Jason's behalf before Percy came. Jason probably isn't a big fan of Octavian because judging from The Lost Hero, he doesn't like people that are bullies/harass his friends and Octavian is one who blackmails the other legionaries.