Why did trolls start bullying me in dm when I said my mom died?

Last week I deactived my account because I couldn't take it anymore. but today I'm back because I miss the good people here and I don't know if one person is doing this bullying on me with many accounts or if it is really more than one person, but they do. Why? I really wonder why they are happy to ruin a person's day? Even if I closed my DM, they were sharing opinions about my mother as a anonymous to the questions I asked.

Why did trolls start bullying me in dm when I said my mom died?
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