The intent of constructive criticism is improvement and focuses on an issue; like when I suggest removing barriers so persons with disabilities can equally participate in the community, or pointing out potholes to fix roads, or a lack of community pool for fitness – all things that help make a community better. Who would object to that?
Some people, based on their perspective, may perceive constructive criticism as negative feedback and dismiss it, ignore it, minimize it, defend it or argue against it for whatever reason.
Constructive criticism is not about focusing on any personal attributes, demeaning a person, finding fault, insults and public humiliation once or even repeatedly; destructive criticism harms and doesn’t help.