You're looking for something to be angry at.
What are you blathering about? It's clearly inflammatory. There are far more American non-college graduates who have been major league managers than Dominicans. If he was trying to make a point that you don't need a Harvard education to be a baseball manager, there's a far less inflammatory way to make that point by just saying, hey, look at all the kids who get drafted right out of HS and end up being major league managers. It doesn't take a rocket scientist.
He could have said that.
Instead he picks on the DR, AND lied by the way - Dominicans only make up 10% of MLB rosters as of 2014. 28% are foreign-born, however, which is what I assume Cowherd was referring to because I have no doubt there's little difference to him between Venezulans, Dominicans, Cubans, etc.