Wikipedia sayeth...
Defamation: the communication of a false statement that, depending on the law of the country, harms the reputation of an individual, business, product, group, government, religion, or nation.
Example: "Kemper uses child labour to build their hardware."
"Kemper sucks" is not defamatory because it's an opinion. Memes like "yo I put a profiler in your profiler so you can profile while you profile" or "...but in a blind test..." are not defamatory because... well, they aren't stating anything at all and are just making a joke (whether you find it funny or not) in reference to the Profiler.
Parody: a work created to imitate, make fun of, or comment on an original work—its subject, author, style, or some other target—by means of satiric or ironic imitation.
Satire: "For its nature and social role, satire has enjoyed in many societies a special freedom license to mock prominent individuals and institutions.[22] In Germany[114] and Italy[19][115] satire is protected by the constitution.
Since satire belongs to the realm of art and artistic expression, it benefits from broader lawfulness limits than mere freedom of information of journalistic kind.[115] In some countries a specific "right to satire" is recognized and its limits go beyond the "right to report" of journalism and even the "right to criticize".[115] Satire benefits not only of the protection to freedom of speech, but also to that to culture, and that to scientific and artistic production.[19][115]"
Fair Use: limited use of copyrighted material without having to first acquire permission from the copyright holder.
Kemper's trademark isn't protected 100%, as freedom of speech requires the ability to talk about their trademarks, use their images in an article (good or bad) about their product, etc. If you had to get explicit permission to have picture of the Toaster in your review talking about how much you don't like the Toaster, why would any company let you use it?
Likewise, making fun of a company or product is typically considered to be fair use.
As others have noted, Kemper are clearly aware of the page since CK liked one of their posts, and if they wanted to complain to Facebook they certainly could.
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A gross vulgar page. sexually explicit
In your opinion, sure. Facebook has the "hide all from this page..." button for a reason.