self compliments 

Someone that finds way to compliment themselves often

self compliments by Janie , typically take up 6 of her 8 hours at work. She loves telling everyone how awesome she is in every shape or form

self compliments by Shellbell July 2, 2016

Sneak self-congratulation compliment 

When someone leaves what seems like a nice, innocent comment but is actually a sneaky way of congratulating themselves. Usually for something that doesn't deserve congratulations.

This comment left on a soundtrack that was used in the Umbrella Academy series:
Sneak self-congratulation compliment: "Thank you umbrella academy for reintroducing this to the next generation."

It seems like an innocent comment, but is actually a way for the commenter to congratulate themselves for knowing the soundtrack before it was in the series. The commenter also believes that they are better than the people who are just now discovering it, and that he/she should get a reward for knowing the song for a longer period of time.

Sneak self-congratulation compliment by TaiChiTony July 10, 2019