Person B: "What about discrimination against [demographic group of Person A]?"
Person B above has engaged in guilt-tripping, to make Person A feel guilty. This is the evil technique liberalists like Person B use, to push forward liberalism. Rights and oppression come together. Rights are a self-perceived entitlement to have and do as one chooses, leading to bullying.
If you talk to me about rights, don't you DARE use guilt-tripping. There is no such thing as rights, only obligations to be kind to others and be righteous.