Sometimes, I wish we could have a civil conversation without immediately resorting to calling each other racists/sexists/and other ists. I do agree with what some people said on here about separating how to market from accidentally shooting yourself in the foot with bad marketing by disrespecting your audience LOL (I think that should be a separate topic), but I do also think that people were way too quick to be accusing you of ists--or at least on the verge of it (no wonder the word has lost all meaning rolls eyes). Honestly, the psychology behind these companies is fascinating, though. I don't have a problem with lesbian romances, but I do think you are limiting your audience by purely marketing something as a lesbian romance. A very small percentage of the population is gay, and you might have trouble marketing it to the other, like, 99% of the population if you are trying to solely sell the show on that. That doesn't mean that population is homophobic--it just means they most likely won't have an interest in it. I also think those who are gay would be looking at the show and saying to themselves, "Okay. They are gay. What else?"
Even with a straight romance, you would probably market something additional to the romance aspect. For example, while Gone With the Wind is technically a romance, it's also a historical epic about civil war, which might draw in a male audience in addition to the female romance (in fact, it did, because it's one of the highest grossing films). Similarly, Titanic, while a romance, is also historical and the male audience knows there's going to be a giant iceberg in the latter half, so they might tune in. XD
I mean, imagine if someone came up to you in real life and only told you their sexuality/race but nothing else. You would probably be like... "I dunno where to take this conversation." Tell me more specific things about your characters if you want me to get interested (e.g., hobbies, job, struggles, is their romantic life going up in flames? What kind of world do they live in? How does their sexuality/race impact the story, or does it at all?)