Subliminal bragging

Someone who feels the need to brag about their accomplishments by using obscure ways to talk about it.

Or
Someone who will talk about other people's failures and use their mediocre successes to talk about themselves.

Jose: I'm looking forward to you finally attempting a half ironman. I did one because I'm an amazing athlete, but you can to if you train hard

Jason: we failed together remember?

Jose: but I found an easier course, passed now I'm an ironman, I'm really amazing and you will be one day too if you work hard.

Jason: but you did a half not a full. Stop using subliminal bragging to promote yourself.

Jose: iron sharpens iron, you will understand one day if you ever finish one