Why do girls get so upset about guys liking girls pics on Instagram?

I'm not married and don't have a girlfriend but I've never been able to understand this. It's not like we know that bitch in real life? We don't talk to her, see her, have a clue who she is in real life or will ever meet her. So who fucking cares? Why make such a big deal about nothing?

Why do girls get so upset about guys liking girls pics on Instagram?
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