GREELEY, Colo - A Greeley waitress, who was apparently miffed that a customer didn't leave a tip, has been fired after she took to social media to vent her frustration earlier this month. Megan Olson, who goes by the name "megatron" on Twitter, posted the following message on the social media site, angering many who said her tweet was racist:Several residents posted copies of the tweet on Texas Roadhouse – Greeley’s Facebook page. One message read: "A violent and racist employee is very bad for business. Please send her packin’." That’s exactly what management did.