I can think of four consequences of being ugly that immediately come to mind:
1# People label ugly males as nerds. If a handsome guy is strong in academics in school, the handsome guy is labeled as smart. If an ugly guy is strong at academics, the ugly guys is labeled as a nerd, especially if the ugly guy is short.
2# Being ostracized at school for being ugly (this is somewhat of an extension of #1). I always sat alone at the corner of the lunch table during lunch at school.
3# Women are hostile to me for being ugly.
4# Being incel.