I'm starting to think my step son just absolutely hates me

After today I really think my step son just hates me. Several days ago I accidentally knocked my toddler off the couch and she hurt her head and I felt awful when I told my husband what happened my step son said "Great job Casey Anthony ". Casey Anthony is the girl who "allegedly" killed her baby. My husband told me to just ignore him and he's just pissed at his mom but honestly I genuinely think he doesn't like me. Me, my toddler, and my husband were kicking the soccer ball outside. I was kicking it my husband and kicked it as hard as I could and it went passed my husband and hit his son in the face as he was coming outside and his nose started bleeding really bad. I felt really bad and tried to offer him a hand up but he pushed my hand away and he mumbled "And people wonder why step kids end up dead". And slammed the sliding door. My husband went to go check on him and he had to stand over the sink for a quite a while because blood was pouring out of his nose. I tried again to apologize but he just rolled his eyes at me. Idk what I did to him to make him dislike me so much...