do you think I'm being ridiculous or overreacting?

This past weekend we went to our hometown to visit people. My husband was gone somewhere and I had to go pick him up before we could drive back home, but it would have been out of the way to go back to my MIL's to get our stuff, so I asked my BIL (who lives there) to please pack out my duffle bag and my dog's kennel. He wasn't doing anything important, just playing a video game on his computer that could be paused. He asked, "where's ____?" (my husband) and I told him where and that I had to go get him and didn't want to come all the way back for my husband to pack my stuff out to the SUV. He then ignored me for 10 min playing his game, knowing I didn't have 10 min to waste, so finally I have to pack it out myself. He says nothing as I leave. 

I told my MIL and she is furious... but I doubt she'll say anything to him because she lets him walk all over her and has his entire life (which is why he thinks he can do it to everyone else) and when he doesn't get his way he blows up and tries to hurt us. He flipped a huge, heavy solid wood coffee table on top of my SIL a couple of years ago because she asked when he was going to start paying back the $5,000 he owes her since she bought him a car. Nobody said anything to him. 

What makes it worse, is that we help him out ALL THE TIME because he sucks with money so we're always bailing him out. But he can't even help his SIL who's carrying his niece or nephew and has a medical reason to not pack her things out? So we told him next time he needs help he can kick rocks. 

Trust me, I don't enjoy having restrictions and if it weren't for the hematoma I wouldn't have even asked. But someone said I'm being ridiculous. Do you think so?