Is not healthy…

Self-deprecation is the act of belittling, undervaluing, or making light of oneself, often through humor or excessive modesty. It is used to appear more likable, disarm others, or downplay achievements. While often a sign of modesty or a cultural trait (e.g., in British humor), excessive self-deprecation can signal low self-esteem or a need for reassurance.

Dictionary ~ Self Deprecation 

Modest about or critical of oneself, especially humorously so..