Oddly Wired
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psychology

You claim your successes but blame the environment for failures.

The self-serving bias describes the pattern of attributing success to internal causes and failure to external causes, though it remains debated whether this is driven by ego-protection or neutral information processing expectancies.

The claim treats the 'ego-protection' motive as a settled fact of the theory, whereas the seminal 1975 paper by Miller and Ross was written to contest that specific motivational interpretation.

You are rarely as responsible for your failures as you are for your wins.

Where this comes from

Study
Miller and Ross, 1975, Psychological Bulletin
What the check found
While the phenomenon is real, the attribution of it to ego-protection is the very hypothesis Miller and Ross questioned in the cited paper.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.