By definition, boxers are not the brightest lamps in the street - a 'sport' where the object of the exercise is to physically damage your opponent to a point where he can no longer hit you back, preferably by concussing him to the level of unconsciousness and the danger of irreparable brain damage - is not one undertaken by anyone with any degree of empathy for fellow sportsmen or women.
So it's not really a surprise when a boxer comes forward with 'advice' on how to hit people - the problem is, in this case, it's how to hit a woman.
I am sure that, having been exposed for using his professional expertise in hurting people who undertake to let him, by turning it into amateur advice on how to hit women, the irony of advising that, should he encounter the sort of abuse he is condoning and offering advice about, he would wish to visit revenge in the form of extreme physical violence, is lost on him, along with his ability to conduct himself away from his sport with a modicum of common sense and human decency.