It's inevitable you'll meet and deal with these kinds of people at a point in your life. Proud people put others down to make themselves feel better, this means they have really big insecurity problems.
People who are humble do not have to act superior to make themselves feel better, they are proud of who they are and this positive trait rubs off on others.
READ: When is the right time to stop being friends with someone?
Giving proud people undue attention will boost their ego and the best way to stop doing that is to quit paying attention to them.
Watch this video by Marie Dubuque on how you should relate with extremely proud people: