Worlds worst singer may be universal worst singer I guess.
Irritates people with her songs.Even people doing meditation will also get frustrated with her terrible songs.
But I wonder of her youtube video views are over some millions though her dislikes to very high in numbers.
Music lovers will definitly gets angry and will be frustrated by listening her vocals.
Never ever listen her songs with speakers or home theatre your ears can not bare that highly terrible soundwave frequencies produced by her vocal cords so be aware.