Unfortunately, people not liking each other very much is part of the human condition, no matter what anyone may like to think.
A wise and brilliant man we lost last year at the age of 97 satirised it in one of his best songs. Although just as much the target of his satire was the people who like to think they are above that sort of thing.
Mr Tom Lehrer and “National Brotherhood Week”, with “When You Are Old And Grey” as a bonus.