It seems like this is a people management issue, not a restrospective problem. 

Let's first think from the Scrum perspective: as others mentioned, the Scrum Master should avoid the ceremony to go for aggressive or non-value-adding topics. **The team itself can help on that**, but **the Scrum Master is the responsible** for facilitating the ceremonies.

However, thinking on future ceremonies and team sinergy, this should be addressed for this team-member manager to check what is happening with this collaborator. The manager could schedule an 1:1 to get deeper on what could be disappointing this collaborator.