Does this singer simply have unpredictable stubbornness, a serious mental illness, or why can't this DSDS candidate accept no for an answer?

Hello, This DSDS appearance is from 2018, but apparently I think this is the most annoying DSDS candidate in DSDS history: https://www.youtube.com/watch?v=jVB_HmUcdZU I would like to know if this singer has a normal, unpredictable stubbornness, a serious mental illness, which is why this DSDS candidate cannot accept no for an answer? Perhaps one can better…