Being vulnerable and opening up to colleagues can be beneficial. It fosters an authentic work environment, creates connections, and strengthens the team. However, not everyone is comfortable sharing sensitive information with coworkers from the get-go. Drawing such boundaries if one is feeling discomfort is completely fine, and should be respected by others.
Unfortunately for redditor BereavedTriplet0522, when she wanted to keep her personal things to herself, instead of understanding her team members made a scandal. Troubled by this, she turned to the AITAH subreddit, asking if withholding the fact that her triplet brother passed away was wrong.