I think you should stay strong, stay firm, and stay patient. Don't let a child feel like he/she can dictate your parenting by throwing a tantrum. Don't allow bad behavior, like a temper tantrum, yield a positive response by giving them what they want. Try to wait for them to calm down and explain to them why they can't have what they want at that time instead.
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You gotta give them some tough love. If such behavior is left unfixed, it will develop into some really negative behavior when they're older, such as entitlement and being self-centered