People online called him a 'fifty-center' (paid commenter).
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The slang sense — short for 五毛党 (wǔmáo dǎng, 'Fifty-Cent Party') — refers to internet users allegedly paid 0.5 yuan per pro-government post. The term emerged around 2004-2005 and has become a common political insult on Chinese social media.
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When used to mean a paid commenter, 五毛 is highly pejorative. Be very careful using it in conversation: you're accusing someone of being a paid propagandist.
