An Offensive Word?

Many people say things that are supposedly "okay" now but at one point of time it was not. I will take a blast back to the past since things do not really offend me much. Me and my brother were arguing about who knows what, but I know it was something stupid. He is a few years older than me, but we still fought all the time. I was in my last years of elementary, when I still had a bit of baby fat. Well guess what he called me? Fat! I was so upset but I pretended like I did not care. I was a chubby kid, I can admit. Words can hurt a lot though, and that is why I do my best now to say nice things to others.