Am I an a-hole for laughing at someone for having cancer? please read description?

Anonymous
So basically a guy that I knew a couple years ago, he ruined a lot of friendships and relationships that I had. He’d spread rumours about me, he exposed my job to my friends parents, overall he was horrible to me. I’ve hated him since.

Yesterday a friend told me that this guy had just been diagnosed with terminal cancer and I laughed. It was an automatic response and my first thought was “good riddance”. But my friend looked at me like I was a monster, and I told my mom about me laughing and she said I’m an a-hole. Am I really? I know that what he did to me doesn’t warrant him deserving cancer but I don’t feel sorry for him at all.

And no, this is not a troll question. I’m being serious.
Am I an a-hole for laughing at someone for having cancer? please read description?
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