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This is the ultimate way to determine if you are truly a confident person. If you can be happy when a person does something well or is appalled for their good works you can do this. If you are a "hater" this is hard for you to do. Instead, you will talk negatively about them and try to tear down their accomplishment.
What is be happy for someone else, cheer, clap, tell them you are proud of them or good job?