Latino players usually get signed at 16 or 17 and have to play in the minors to get ready for the big leagues.
Asian players, namely Japanese, go through lower level leagues in their own country and come over at age 21 or 22 ready to play in the bigs.
Obviously major leaguers are treated better than minor leaguers.
Also there are more latinos than asians in American baseball so there might be a dozen guys in any clubhouse that can speak and translate spanish, whereas in many cases an asian player will be the only one of that culture on the team.