I did not mind what others【 said 】 yesterday.
昨天我没有介意别人说的话.
因为：
1.句末yesterday 是一般过去式时间状语,主句谓语用一般过去式,did not mind;
2.宾语从句时态受主句时态影响也用过去某种时态,宾语从句动词也受yesterday影响,也用一般过去式.故用said.
3.主句一般过去时,宾语从句在表达客观真理或者自然现象时可不受主句时态的限制,仍用一般现在时..e.g.
He said that the earth goes around the sun.
祝进步.