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OK, that's your suggestion/challenge but you didn't state your objective?
If the objective is simply to cause offence or instigate violence (you said to say it in front of her boyfriend) then you should know that this is only only foolish and immature behavior serving no useful purpose, but is also very risky from a health and safety, as well as a legal perspective.
If on the other hand, your intention is to utilize shame as a tool for reforming her behavior, then you are very off-track with your thinking, very off-track, so much so that I am reminded of the self-evident truth, being that most Holla Forums lads really need a crash course on female psychology.
I'll try to briefly explain why both motivations are at best poorly thought out, at worst malign encouragement intended to bring harm upon my White brothers, although I expect that any replies to my avuncular advice to be met with the usual accusations of " kike ", " coward ", " faggot ", " mgtow ", " white knight ", " nigger lover " and so on, I love every one of you as a brother and making myself the target of hurtful, untrue remarks is a price worth paying if a single one of you is kept from harm.
So anyway, listen up boys. First of all, insulting strangers in the street may seem like a good way to demonstrate your courage and manhood but it is very dangerous. It is a scientific fact that Black men have both elevated testosterone levels and a diminished capacity for impulse control. This explosive combination inclines the negro towards violence and criminality, traits which can be evidenced by reference to FBI or regional/local police department offender statistics.
Insulting a man's sexual partner in his presence is perhaps the surest way to bring about an immediate and violent confrontation with said gentleman, and adding a personal racial element to your provocation will virtually guarantee an immediate response involving felonious violence. You are 16-24 years of age and probably consider yourself immortal but in fact your age group has the highest homicide victimhood rate of any demographic. Every day in the United States, young men just like you become cold dead statistics lying rotting on a mortuary slab.
Well, that escalated quickly, don't you think? We have jumped from an insult to a life or death situation, all for an act that will accomplish nothing of benefit to the White race, for reasons that will be explained shortly.
This isn't /k/ so we will skipl the theorycrafting of combat scenarios and discussions of caliber, 21 foot rule, suffice to say that if violence erupts, which is likely, then there is a good chance that someone will end up dead. Also bear in mind that it could be the woman who pulls a gun or a knife, are you going to kill a White woman when, presumably, it was her you set out to "save"? Unforeseen consequences are a bitch don't you think?
So, we are at the point where you or he ends up dead or seriously injured, perhaps crippled for life. If it's you then the White race has lost a part of its future, not only you but all of your descendants, potentially thousands of White people who will never exist. If it's him, now you have to defend yourself in court, juries don't like men who make women cry and they don't like racists either. Plea deal for 25-life, man down, you're out of the fight.