thats not funny this is
In order to become a DOTA pro, you have to discard any semblance of respect and regard for your fellow human being. Everybody who A) is not you and B) is not helping you win a game of DOTA is less than human. Sub-human. Be sure to treat them as such.
Profanity inserted several times into each and every sentence you speak (or type) needs to become second nature. You need to be able to demean people without hesitation - practice insulting your own mother to her face.
Remember: EVERYBODY is garbage besides you. If somebody is better than you, THEY ARE CHEATING. If somebody is worse than you, THEY ARE FEEDING and need to be added to the ban list. (Hopefully, you're hosting, and you can kick them at will)
If you master everything I've said above, you will too become a DOTA pro. It takes a lot of work - but I know a lot of people who have mastered it.