Now, everyone wants to be her friend.

Bet you feel pretty stupid now, cruel fourth graders! (via Facebook)

Last week, a girl named Mackenzie Moretter from Shakopee, Minnesota turned 10 years old. Sadly, it looked like Mackenzie would be moving into double digits solo, since every single one of the classmates she invited turned down her invitation. "I was sad that no one was coming," said Mackenzie in the emotionally devastating understatement of the year.

Mackenzie's isolation from her classmates is due to a rare growth condition she has called Sotos Syndrome. At the age of 1, doctors discovered a tumor on her spine and she was diagnosed with the little-known genetic condition, which caused some brain damage and developmental delays due to the rapid growth of her skull, making socialization a challenge.

A couple pics of @Mysticlake's incredible cake!!! @kare11@RiverSouthMNpic.twitter.com/mnrY2Nnqqb
— Brad Tabke, Mayor (@MayorTabke) April 19, 2015

"It causes gigantism where kids grow at a faster pace," said dad Matthew Morreter, "Mackenzie is a lot taller than other classmates." It's not that she's bullied, her father explained, just ignored. "Kids are friendly to her, but she doesn't have friends. No one calls and talks to her. I'll show up at her school and she will be playing alone."

Facebook—Occasionally a place that makes the real world a little better.

After many years of playing alone, this year Mackenzie told her parents she wanted "a big-girl party" for her birthday, and happily for Mackenzie (and our collective capability to keep going in this cruel world), Mackenzie's mom Jenny Moretter took to Facebook to make sure that happened.

RT @dave_taft: Mackenzie's Birthday party is full of SO many awesome people!!!! #HappyBirthdayMackenzie#Shakopeepic.twitter.com/Jri7kHyJFX
— Brad Tabke, Mayor (@MayorTabke) April 19, 2015

Jenny created an event titled "Mackenzie's Birthday Party" and invited her own adult friends to save her daughter from sitting alone with a DJ on her birthday this past Saturday. She hoped to convince at least 10 of them to attend and bring any children around Mackenzie's age. As it turns out, her social media outreach turned this heartstring-pulling act of cruelty by omission into a heartwarming story of people being awesome.

The celebrity-packed event of Shakopee's social season.

Instead of 10 of mom's friends and some disinterested kids, Mackenzie's party ended up being attended by Minnesota Vikings wide receiver Charles Johnson, Elsa from Frozen, the Shakopee Fire Department, the Mayor of Shakopee, and at least 300 other local nice people. Mackenzie hosted them all while wearing a shirt emblazoned with the words "courage" and "kind."

Maybe even better, the event was catered by Sam's Club and Mr. Pig's Stuffed BBQ. The mayor proclaimed Saturday, April 18, 2015 to be Mackenzie Moretter Day throughout his domain. Said a spokesperson for the mayor, "Thank you for reminding us how we should treat each other every day."

Happy birthday, Mackenzie on Mackenzie Moretter Day in #Shakopee! pic.twitter.com/cb14i5I3ME
— Brad Tabke, Mayor (@MayorTabke) April 18, 2015

As for Mackenzie, maybe the mayor should be worried after her first forays into public speaking. Addressing the assembly of well-wishers, Mackenzie said "I have a hard time making friends in school, but thanks to all of you... my voice was heard. I love you all."

The good feelings don't stop there. Although lots of people came bearing gifts for Moretter, she and her family used the attention to start a GoFundMe page for donations instead, raising $2100 for Sotos Syndrome research.

In conclusion, always go to the lonely kid's birthday party, or else that kid will become famous and beloved and everyone in your town will go without you and talk about what a jerk you are and how great that kid is. Also, be nice.