It's a meme generator. Nobody's going to believe that the person who operates the site "said" anything on there.

Next are you going to upload an image to imgur that "looks like" the creator of imgur is saying something bad?

Imgur has responsibility for all of the content it hosts.

Well, only in that they shouldn't be hosting illegal content (e.g. CP). But beyond that, nothing they host can be construed as being "said" by imgur.