Are you referring to JD's three-run HR in the bottom of the first in Game 1 of the 2018 ALDS? That was definitely a great moment for Sox fans watching in the stands or in front of TV sets.
To me, it wasn't so much a Sox-Yanks response -- even though after 3 Sox WS titles, Fox was still showing a million clips of Dent, Boone and Buckner for every Tek mitt-sandwich to ARod's puss. That shot was more like a clarion call to the MLB that Boston, with its new star clean-up man, was again a serious threat, after quick playoff exits the previous two years.
In '18 Martinez definitely delivered, leading the big leagues with 130 RBI in the regular season, and again in the postseason, with 14 RBI in 14 games.