What is what does it mean when someone calls you a tool?

Being called a "tool" is generally considered a derogatory term. It implies that someone perceives you as being used or manipulated by others for their own purposes, often without your own awareness or benefit. Here's a breakdown of what it means:

In summary, being called a "tool" is an insult that suggests you are being used and taken advantage of, lacking independence and being treated disrespectfully.