If you cannot handle losses you in the wrong business, as the majority of traders.
I'd probably fall into this category of an unsuccessful trader, but there is nothing I hate more than losses. If I have given an opposite impression on ET in any way, my apologies because that is not the case.
The "you're playing with house money" after taking a partial winner might be one of the dumbest things I've ever heard. You are never playing with house money! It is your money!
To be honest, I was this kind of trader too. Now I learn that losses is part of my trading journal and I have no power to change it but to evaluate it. Yeah, evaluate your daily trading (both profits and losses) so you wouldn't do the same mistake again.
Losing still sucks though, although it is a part of the game to get to winners.

"Erase your passion of gaining profit, focus yourself to learn"
The horrors of losses itself comes from our perception. Most of traders fear to lose because they focusing too much on reasons to lose rather than reason to win...That's a good motivation for young traders to push them to learn more about forex trading.
And yeah, horrors of losses crawling beneath your sanity because you're concentrate too much on reasons to lose...