This is assuming, of course, that the verse really applies to Jesus.
Isaiah 50 includes one of four songs called the songs of the suffering servant. (Also, Isaiah 42, 49 and 52-53.) In numerous places in the New Testament, these verses of the suffering servant are cited as referring to Christ, even though that particular verse is not one of the verses cited. Even the Talmud identifies the Suffering Servant of Isaiah in many places as referring to the Messiah; the later Jewish notion that it refers to the entire nation of Israel in no way contradicts this.