He is just a bandwagon fan who only likes the winning team.
bandwagon fan
idiomA fan who has shown no past loyalty to a team and supports them all because they are actively succeeding or trendy.
Many people became bandwagon fans of the team only after they reached the championship final.
The stadium was filled with bandwagon fans who had ignored the club for years but suddenly claimed to be lifelong supporters during their historic winning streak.
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bandwagon jumper
One who jumps on the bandwagon.
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fair-weather fan
A fan who only pays attention to their favorite team when they are performing well.
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fan dance
The incremental disclosure of tantalizing bits of information.
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fan the flames
To intensify or worsen an already difficult situation.
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fart fan
A ceiling fan in a bathroom
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hit the fan
To have a dramatic, usually negative, effect.
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jump on the bandwagon
To profit from a craze; to join a trend.