Finish Line review: sales associate who is homophobic

I wasn't sure exactly where to go to file a complaint but I will start here, on
Wednesday October 23rd my son and I walked into the Grand Central Mall finishline, we have always loved this store up until tonight. We walked in and had been greeted by a girl named Maddy, she was very friendly and did ask if we needed help. We said yes and asked for help picking out a pair of shoes for my son, he really wanted pink or purple shoes and she tried to steer us into a different color selection. After trying on a pair or two of shoes we explained that pink or purple shoes had been on my sons birthday list and was why we wanted to see what the options were and at that time was when we asked why she was pushing other colors and shoes styles on us and what she herself would recommend, she stated "I mean I'd recommend red, black or white shoes, you wouldn't want to be called gay for having pink or purple" and we said thank you and left. My son is gay. He had just came out to us earlier this year and I was absolutely dumbfounded on what had occurred. We will not be back. My son was so heartbroken and mortified that he felt ashamed and embarrassed by what happened. I can't even fully grasp it myself. I really hope this isn't taken lightly or brushed off. I will be contacting corporate about this!