Blow his own trumpet? 自吹自擂

Reader question: Please explain this headline: Never one to blow his own trumpet. Low grades reduce children’s self-esteem so that educators began artificially raising grades to help children feel better about themselves as well as helping parents to believe that their youngsters were excelling in school. “Dark Brandon” the nickname coined by Joe Biden’s supporters to describe his formidable side was in full effect last week as the US President launched his re-election campaign in a barn-burning State of the Union address before Congress. It taps into understandable concerns about Mr Biden’s unprecedented age for an American president stoked widespread perceptions, while framing him as a criminal kingpin had little traction beyond committed right-wingers. I’ll be darned” – illustrated that Mr Biden was not merely quick-witted on the evening but also thoroughly enjoying himself.