There’s also an alleged story where Guerrero Sr. was at Yankee stadium as an opponent (possibly with the Angels) and Vlad Jr. was on the field with him before the game doing warmups/practice. Yankee staffer allegedly said kids weren’t allowed, and kicked him off the field. Meanwhile Yankees player’s kids were allowed to stay.
Apparently the Yankees did the same thing to Griffey Jr when he was a kid visiting with his dad.
Also probably has to do with the Yankees fans treatment of Pedro Martinez, his godfather.
Just a bunch of little things that add up over the years.