We don't have to define our self-worth by what other people think. Looking into the 8 worldly dhammas and learning how to reflect on them is very helpful in guiding inner and outer evaluation of our self-worth. If a person thinks they are superior to us, well, their opinions belong to them and our opinions belong to us. If they actually have good qualities and we have a problem with that, then we have to look into our own tendency to jealousy towards that person. If we have a tendency towards a negative self-worth and we are jealous of that person, we only give them more cause to believe that they are superior to us.
So actually if they are showing qualities, our ability to take happiness in their good qualities and congratulate them for any of their achievements helps to perhaps show them that we are not jealous, then they may not form a more negative opinion of us. Rather than having feelings of superiority, they may be thankful and appreciate that someone has taken joy in their beneficial qualities.
In any situation it is up to us to feel secure in ourselves about our own self-worth. If another person's opinion tries to put us down then that is their opinion and we can measure our own self-worth by the qualities that we value and manifest.