1N-COUNT 茶杯 A teacup is a cup that you use for drinking tea. 茶杯
2PHRASE 茶杯里的风暴;小题大做;大惊小怪 If you describe a situation as a storm in a teacup, you think that a lot of fuss is being made about something that is not important. 茶杯里的风暴;小题大做;大惊小怪 [British]
Both are trying to present the disagreement as a storm in a teacup.