If you think this is offensive you need to look up Satire in the dictionary

Rating: 8/10 (25 October 2019)

This is fantastic Political Satire; we need to be able use Satire in the correct way and Waititi did just that. If you think this movie is offensive here is Satires definition:
Satire
1 a literary work holding up human vices and follies to ridicule or scorn
2 trenchant wit, irony, or sarcasm used to expose and discredit vice or folly