not at all, if one feels strongly that it's wrong, then they by all means should state it. but not in a way that deliberately provokes the other party into a defensive state, which the example of this cartoon would have done. there are WAYS of saying what you want to say without automatically offending the other person.
it is an illusion because it doesn't exist in the real world. people won't condone hearing just anything. you have to taper your thoughts with regard to the other party's culture, customs and accepted level of etiquette, otherwise your words will likely be dismissed -going against your objective of bringing the issue to light.
words can have as much, perhaps MORE, impact than sticks and stones. words catalyze thoughts, and lead to certain actions - they are a very powerful way of influencing what people do. why do you think politicians rule the world, instead of engineers, or scientists, who actually manipulate the forces behind those "sticks and stones"? because one forms the rationale for even attempting the other; you need to be convinced before you'll do anything physically damaging. or unconvinced, as the case may be.