The Toronto Blue Jays are an employer, one whose employees work in a very public setting. Major League Baseball acts as a sort of umbrella employer as well. How they choose to define and enforce decorum is entirely up to them. Shouting the same word at a co-worker or associate from a competing company would find many employees of other companies and organizations in a similar, if not worse, situation. I’m not entirely sure what’s “newsy” or “controversial” about this.
Frankly, professional athletes are given far more leeway in how they conduct themselves on the job and react to stressful situations than most people in other lines of work are.