What our world deems as 'ugly' is usually based on our outward appearance. Think of the story The Ugly Duckling. The duckling wasn't deemed beautiful because it did not have downy white feathers as the rest of the ducklings did. "Ugly" by today's standards is the same idea. It's all about what you look like. People who don't have the prettiest face, bone structure, slender waist, perfect hair, are all deemed ugly. Some people go to great lengths to look beautiful according to the world. Some even go dangerous routes to do so, going under the knife to alter their appearance. It's a superficial stance, one that really warrants its own makeover.
But the beauty of "ugly" in either scenario is that these people - fat, thin, short, tall, "pretty" or not so pretty, and even mean-spirited or not, really are not ugly but beautiful because they were made in the image of GOD. God is LOVE. Love is beautiful. Try to put that under a scalpel to dissect and rearrange. You can't. No matter how badly you want to erase all the mean people of the world who are truly ugly, or even the ones you don't find attractive, beauty will exist in each one because of God's love.