He is just a bandwagon jumper who likes the winning team.
bandwagon jumper
idiomOne who jumps on the bandwagon.
Many people became fans only after the team reached the finals, proving they were nothing more than bandwagon jumpers.
The sudden surge in popularity for the obscure author attracted many bandwagon jumpers who had never actually read a single page of her work.
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bandwagon fan
A fan who has shown no past loyalty to a team and supports them all because they are actively succeeding or trendy.
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jump on the bandwagon
To profit from a craze; to join a trend.
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puddle jumper
A small passenger airplane, typically used for shorter connecting trips to smaller airports.