American mustard tastes of road.
English mustard is only for real men.
French mustard is for who like men.
This is hate speech against yellow mustard.
As such, it is probably subject to the Ministry of Truth unpersoning the poster and transporting him to a gulag.
In the future, we will fix this situation by application of Newspeak. Will will make it illegal to use the word "yellow." We will delete the word "yellow" from vocabulary and from all past print and media. Then there will be no ability to disparage yellow mustard because no one will have any words to describe it.
And you will eat your bugs with [xxxyellowxxx] mustard and like it.