To be completely honest, Dasher had never found anything wrong with your nose per say, but what he can say is that Donner did a pisspoor job at hiding your lil' shiny nose in the first place. Even his reaction when Santa finally saw through the other bulls' foolishness was extremely inappropriate, although... Dasher himself may have cracked a few jokes here n' there, so he wasn't exactly the image of responsible.
No doubt, you were already having enough trouble back home with the other lil' reindeer calves having little to no sympathy for your unique features. But alas, they had none, nobody did it seemed. Huh. How sad it was that you were being judged for something you had no control over and shame on Donner himself for only encouraging this foolish pickin' n' name callin' by being so openly ashamed of you- his own calf, you were supposed to be his pride and joy he showed off to the world. Not some hush hush secret he would hide from the world. And if not for your mother being so adamant on actually treating you as if you were a normal reindeer calf as everyone else and not some disgrace that Donner had made you out to be. Heck, he would go as far to say that Christmas would never be the same without you leading the group and guiding Santa's sleigh each Christmas Eve so he can see through any clouds, or storms that may fog up the starry night sky that particular Christmas Eve night.
Just as his speed made sure that Santa got all around the world, to every single house on to time too, as all the reindeer that individually pulled Santa's sleigh had their own specialties, yours was simply more apparent and brighter than most, but nothing to be laughed at nor embarrassed by. But now... Christmas day had finally arrived, although the whole process was just as stressful every single time but still, they were able to get the job done and give every child a merry Christmas.