I had an argument over... smelly feet

To make it short I was at a friend house on Friday for a coffee and after a while her 7 years old son arrives from school. He kisses his mom on the cheek, I was sitting on the sofa in the living room, and the boy sits next to me, then proceeded to kick his white, dirty, rotten, used sneakers off his feet. I noticed he wasn't wearing socks. He then places both his feet on the sofa, and I immediately notice a super strong scent that smelled similar to cat piss. I move from the sofa and my friend notices it was due to the strong smell. She confronts me on that and I tell her he should wear socks. She answered he was in a hurry that day and didn't have time to put them on. Finally she said that I offended her by moving off the sofa treating her son like someone that stinks lol. We didn't talk since that as I feel guilty and I'm afraid she is still mad...