How is the Supreme Court overruling a case that happened 50 years ago unconstitutional?

Karine Jean Pierre said that the overruling of Roe v. Wade is unconstitutional and the Supreme Court does not have the right to overrule a decision that has already been decided on.

if that is the case then Karina John Pierre should not have gone to school with white kids or Asian kids or Mexican kids I don’t know if you’ve heard of a case called Plessy versus Ferguson but that ruled that you have a constitutional right to have separate but equal schools therefore a little black children should not be going to school with little white children this was a stupid case. Plessy versus Ferguson was overruled by Brown versus board and we got the civil rights movement after that. I don’t know if you remember Eisenhower is sending troops down to Little Rock Arkansas so that nine black students could go to a school that was predominantly white but according to her logic Plessy versus Ferguson should never have been overruled. Is she stupid or does she actually believe that little black kids should not be going to school with little white kids.

How is the Supreme Court overruling a case that happened 50 years ago unconstitutional?
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