I've been employed at my job for over two years and today I got my first complaint for being "rude…

I've been employed at my job for over two years and today I got my first complaint for being "rude and blunt". I'm sorry sir but when you get in my face and start yelling at me and arguing with me I might be a little Stern, especially when I'm eight months pregnant and have a six pound baby crushing my hips. #notreallysorry