I've worked 2 days at a facility where we watch kids, allow free play, and also do some education. A couple of my female coworkers do not hesitate to yell at a child or group of children near the top of their voice. I don't know if it's abusive, but it's rattling even to me in my early 20s. The children seem to be used to it. How can I change this behavior and keep a positive professional relationship?