Is price discrimination ethical?

Price discrimination is almost ethical as it can lead to human welfare. However, it's unethical to raise prices for people based on their race or religion or when it goes against antitrust or price-fixing laws. For instance, companies keep cookies to keep records for marketing purposes. The customer may refuse to use the cookies if they want. But, if this data is used only to alter the price for a certain category, the practice becomes unethical.