If this is USA Test Prep there is most likely a hint button on the bottom left which will help, but in this certain instance the passage says he has a distaste for the opposite sex.
The most important rule of survival Brian learned in Chapter 8 was that "feeling sorry for yourself didn't work..It wasn't just that it was wrong to do, or that it was considered incorrect. It was more than that - it didn't work".
Its saying basically that there are hidden secrets underneath people. That every smile, nod or wave has a hidden agenda. It's like warning to be wary of who you trust.
