Oh, definitely. Blaming the opponent is something that I’ve also started doing, but also quickly found out that it doesn’t really work as well as blaming teammates in regards to your mental state.
“My noob teammates kept feeding the enemy, so there’s not much I could’ve done even if I played better.” shifts your guilt almost entirely on them. “The noob enemy chose an ease cheese strat” always has the slight problem that you always have to add (consciously, or you just know it subconsciously) “that I didn’t recognize in time and I didn’t manage to counter”. And that feeling will nag you :D