My guess is your Rangers fan friends don't think twice about the "Potvin sucks" chants they do 12 times a game at the Garden. Potvin has been retired for almost 20 years and they still do it, but its ok for the Rags because its "tradition."
The "rangers suck" chant is at least somewhat relevant during a Devils/Sens game in February because (a) the Rags still play in the NHL, and (b) they do actually suck. Rags fans don't like it because deep down inside they know its the truth.
That still doesn't make it relevent at all.
Let the Rangers and their fans have their dumb "traditions." Just ripping one of theirs off for the past 8-10 years doesn't make ours right or better.
I swear every year I hear more of the Rangers suck chants than I do of "Let's go Devils" and it just shows what a huge inferiority complex our fanbase has.