My parents used to say that they will not tell their children who to marry; they only asked that we listen to them if they did not us to marry someone.
Should parents have a veto? It depends.
Should they be making the selection for their child to approve of? It depends. Some children want their parents input, some don’t.
Should they have absolutely no input if their child is deadset on marrying a specific person? Depends if they have spoken to a Rov for advice. If they have, and the Rov’s advice is to give their input then yes they should voice their concerns.
Is it different whether the child is a son or daughter? No.
I personally know of a married couple (celebrating their Golden Anniversary) that the husband’s parents did not want the marriage to take place. The family went to R’ Moshe TZATZAL who advised that the couple should marry even though the husband’s parents objected.