What do you think about me believing it would be better for me if your mother was dead?
What?! How could you possibly think it would be better if my mom was dead?
She's always making you do things that you don't want to do, so this way, you will be released from her control
It is wrong to wish that any other person was dead, especially someone else's parent.  Parents do what's best for their children, even if kids don't realize it at the time, and anyone else would be justified in not wanting to be your friend if you wished death on their parents.
I was just joking around when I said that.
You shouldn't joke about wishing someone's parents were dead, because that is considered a very disgusting joke, you know? Most people won't find that funny and think that you're weird for wishing ill on someone's loved ones.