A lot of guys are too considerate to get what they want out of life. It’s not that being inconsiderate is the key, it’s that sometimes you need to be inconsiderate to get the things you want. Our society venerates meek behavior but at the same time it rewards people who have the ability to be selfish.
It’s not about being completely one or the other though, it’s about knowing when to be what. But in order to know when to be inconsiderate, you have to learn how to do it properly.