Common Mistakes During Ramadhan & Revision Time (merged)

Re: Common Mistakes During Ramadhan

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7) Some people take the opinion that if they see someone eating or drinking they should not remind the person that he/she is fasting. According to Sheikh Bin Baz (ra), this is incorrect and it is an order from Allah for us to ordain the good and forbid the evil. Thus we tell the person, because we are forbidding the evil this way.
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Quite confusing. Who is Sheikh Bin Baz? A person eating during Ramadhan is doing 'evil'?