All they care about is the statistics of which groups are going to be more likely to buy their product. They're going to sell a lot more facial hair products advertising to people identify as male than if they spent the same amount of money to advertise to anyone with a less targeted ad.

Not your preferences personally, but the preferences they think you have based on those categories because there are a lot of preferences that society says people of those genders are supposed to prefer. It's used in almost all advertising categorization because the majority of people give in to conforming to those preferences in order to fit in. Most men don't wear lacy pink and purple or they get called sissies or whatever, so they don't advertise lacy lingerie to people categorized as men for example. Otherwise they're wasting their ads. But LGBTQ+ people aren't really considered in these things because most ad companies are too conservative and even admitting LGBTQ+ people even exist is hard to get people like that to do.