Advantages of being an underdog is that no one gives fuck about you. It helps you to lead a life in your own way. Living life without anyone watching or constantly monitoring is bliss. It means you are not under any scrutiny or FOMO.
As a result, you become more fearless and take all the decisions out of the box. In short, you are not scared of doing the unthinkable.
Society hates underdogs because most form herds, and underdogs don’t have any option, which goes with the majority.
In most instances, the world has come to a new life with the effort of underdogs. Because they survived and thrived where more humans would give up.