A project manager is defining the sprint goals with the team, A team member who...

According to the Agile Practice Guide, one of the principles of agile project management is to "build projects around motivated individuals. Give them the environment and support they need and trust them to get the job done."1 Therefore, the project manager should not ignore, punish, or override the team member who has a different opinion, but rather try to understand their perspective and work with them to reach a consensus. This can foster a positive team culture and improve the quality of the sprint goals. References: 1: Agile Practice Guide, page 10.