Why do a lot of people call astrology BS, and mock it, without even looking into it?

A lot of people just go off and call astrology BS, and mock it, yet nobody wants to actually look into it. There is a such thing as a natal chart, which explains why we aren’t just 12 signs alone. The sun sign determines your original personality, the moon sign determines your emotional nature, the rising sign determines your physical appearance and persona, and there is so much more to look in to. by the way, I’m a Pisces sun, Libra moon, and Libra rising.
Why do a lot of people call astrology BS, and mock it, without even looking into it?
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