Free Speech by definition allows for criticism in return.
Consider: if one wishes to justify "nasty behavior", as you call it, using the principle of Free Speech and then tries to also demand that no criticism be returned -- then this individual is clearly non-serious about Free Speech concepts.
Consider: if one wishes to justify "nasty behavior", as you call it, using the principle of Free Speech and then tries to also demand that no criticism be returned -- then this individual is clearly non-serious about Free Speech concepts.