If you are offending people, you're likely performing the zipper merge incorrectly. The point of the zipper merge is maximize efficiency and safety by matching

If you are offending people, you're likely performing the zipper merge incorrectly. The point of the zipper merge is maximize efficiency and safety by matching the speeds of the two lanes. The wrong way to zipper merge is to drive past the other lane and merge at the end. The correct way to zipper merge is to drive at the speed of the nearby lane and merge at the end. When you zipper merge correctly, almost no one gets upset.