Car seat in the shopping cart

I had my baby in his car seat in the shopping cart at Walmart. Some black lady stopped me and said, "You really really need to face the car seat towards you instead." I was confused and asked, "Oh, is there a reason?" And she just said, "You'll thank me later." Anybody know?? I just like having him face everything as we're walking because he really loves looking at EVERYTHING. He enjoys the world.