[Rythos]

I really like the idea of the "You Suck" mindset. Though as others have mentioned, I don't think it's supposed to be as harsh as it sounds. Putting yourself down doesn't get you anywhere, but being aware of the fact that you have a lot to improve is very helpful. It can be easy to get angry and attribute your losses to what your opponent did, ie:

"He's a &*@$% for cheesing/rushing/all-ining me"
"That unit/ability/race is overpowered"

Those thoughts don't contribute to you improving as a player. However, if you focus on your part in losing a game, you can start to think much more productive thoughts like:

"How can I defend against that strategy in future?"
"Could my unit composition have been better for what I was against?"
"Was my scouting, build execution or macro lacking?

That's how I interpret the idea anyway. You don't want to beat yourself up over failures, but if you acknowledge your part in them you're in a much better position to improve.