Why would a person purposely search another person they don’t like on social media just to write a mean comment?

Another person who isn’t a public figure wrote “I feel sick when I see their face” underneath this public figure picture on Instagram.

I was just thinking in my head why would a person purposely search up another person they don’t like. If looking at this person gives you negative emotions then don’t look at them.

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I was looking at this former politician Instagram account because I don’t have a problem with them.

It seems like that other person that commented did.
Why would a person purposely search another person they don’t like on social media just to write a mean comment?
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