I watched that replay a bunch of times, and I'm a Yankee fan who is glad it was called a HR.
But I think you are both crazy if you think the replay shows 100% one or or another. This example shows how even replay can't be perfect. You can interpret this either way. Perhaps it came down into the stands and bounced off of the fans chest, making it a home run. Or perhaps the fan is leaning over so much and hits the ball with his glove in which it was interference.
No way it is 100% sure either way. I bet if we did a poll we would get about 1/3 say HR, about 1/3 saying interference, and about 1/3 saying they didn't know.
There are a few things with the New York Yankees that never change. That's pride, tradition, and most of all, we have the greatest fans in the world. -Derek Jeter, 9/21/08 -- last words from old Yankee Stadium