Estrada is one of the best actors in the world, he is in telenovelas, etc. He's huge.
Lowe is big too, he is on 911, a cop show, so obviously he's gonna take offense to Kaepernick.
Verlander and Upton are seen as American patriots, they don't want politics in baseball. Just play the game. Baseball is seen as a patriotic, old school sport. The likes of Kaepernick are not welcome there. Verlander made it specifically clear, and his wife, who goes to games as well.
It's not shut up and dribble, but it's more like, what can white fans do about it? Do you notice hockey doesn't have this problem?