Yes, if a person is single and they have blocked their ex on social media, it generally indicates that they don't want to see any of their ex's posts or have any direct contact with them through those platforms. Blocking someone on social media is a way to restrict their access to your profile and content while also preventing them from reaching out or interacting with you.
Blocking an ex can be a way for the individual to create emotional distance and protect themselves from potential hurt or negative feelings that might arise from seeing their ex's posts. It can also serve as a boundary to avoid getting drawn back into the past or any potential emotional entanglements.
Of course, the specific reasons for blocking an ex may vary from person to person. It might be due to a desire to move on, heal from the breakup, or simply maintain a healthy separation. Whatever the case, blocking someone on social media is a personal decision made to safeguard one's emotional well-being and maintain their own sense of autonomy and control over their online space.