Why did he get mad over an opinion?

So my fiance and I had a discussion about whether to tell someone straight away if they're loved one is dead at a crime scene (he's a firefighter). So he said you shouldn't because it's a way on how to do things in a professional manner. So I said why not tell them on the spot because there's several instances where people get killed and the police tell them right then and there. I get where he's coming from but it just all depends. So he brought it up to my mom and then he said that it was irritating because I didn't understand. I'm like I do but it's not a big deal it's just a different opinion. So he said "that's why you're not a professional at anything because you'll make people mad". I'm like what that's just taking things all outta proportion...

Why did he get mad over an opinion?
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