He'll probably say it was done tongue in cheek, or in order to undermine the proposal put forward, but Guido's suggestion that people just tell a blind man that something is one colour when it's actually another is, well, unsavoury.
He might think he's being funny; actually, he's being discriminatory:
Disability-related discrimination[:] This form of discrimination refers to treatment of a disabled person that [a] is unlawful because it is for a reason related to a disability; [or b] is less favourable than the way in which others, to whom that reason doesn’t apply, are treated[.]
