Synonyms of 'spoilsport'
killjoyDictionary, misery (British , informal) , wet blanket (informal)
a jealous spoilsport who can't take a joke
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If you call someone a killjoy, you are critical of them because they stop other people from enjoying themselves, often by reminding them of something unpleasant.
Don't be such a killjoy!
Thesaurus for spoilsport from the Collins English Thesaurus
If you say that someone is a spoilsport , you mean that they are behaving in a way that ruins other people's pleasure or enjoyment .