It’s because you’re coming off as clueless and tone deaf. Your post is argumentative just to make a point, and clearly demonstrates you don’t know much about the subject.

Who cares if the definition is slightly different? We’re talking about the same emergent phenomena and I think you realize that.

People upvote contributions not trolls.

Welcome to HN!

I would guess that people think that the author's preferred definition doesn't preclude other people from having different definitions. You seem to assume it does, at least in the context of this discussion, and that assumption is noxious to the people who are downvoting you.

I'd add that while the Author is correct--bokeh is a property of images, not lenses--its not materially different that how most photographers understand the term. While a lot of photographers may say things like "that lens has great bokeh", they don't think that bokeh is some quality in the lens. They are just shortening an idea lke "this lens produces images with great bokeh." It is a lazy way of rephrasing it, but I have never met a photographer that thinks bokeh is not referring to the image.