What do you call a person who has to reply on everything you do or say?

A person who feels the need to reply to everything you do or say can be described as overly opinionated or excessively critical. They may also be referred to as a nitpicker or a busybody, as they often feel compelled to comment on or interfere with others' actions. In some cases, this behavior might stem from a desire for control or a need to assert their perspective.