Yes, there is a possible ethics violation that you should tell red about if he uses this slogan. It is basically trademark infringement.
When a trademark's exclusive rights are violated without the owner's or any licensee's consent, this is known as trademark infringement. An injunction or a letter requesting the violator to halt using the trademarked material is the most typical punishment for trademark infringement. An intentional breach of trademark law may also result in criminal or civil sanctions, albeit this is uncommon.
In response to a charge of trademark infringement or dilution, the defendant may use either a parody or fair use affirmative defense. When a descriptive mark is used in good faith for its principal meaning rather than a secondary meaning and no likelihood of consumer confusion exists, this is referred to as fair use.
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