I think there may be some confusion. The "it" that doesn't matter is whether a GL F&AM or AF& AM. It really doesn't. As I noted, my mother GL has been both.
In our culture, boldly declaring you are doing something just to get an office can be problematic. That doesn't mean you shouldn't desire to serve. But I had noticed the phrase as well.
If our NM brother's comments rose to the level of unforgiving for you, then you are going to have a very tough time of it in the fraternity and, indeed, in life.
And name calling, particularly in a forum with many military in it, isn't going to engender fraternal love. Besides, there are far better terms for Army than GI Joe.
I recommend we leave it here with all of our best wishes for a successful convocation and exaltation.