But Netflix said their algorithm is based on personal behaviour during a user's experience.
Netflix shows different posters to different users to entice them to watch, and uses your habits to decide which poster to show. "Because if something is black, I take no offence in being catered to".
Using the promotional shot of two black actors for Like Father - which is made up of a mostly white cast with Kristen Bell as the lead - she added: "It's weird to try to pass a film off as having a black principal cast. when it's a white movie".
It's beyond deceptive to think that I am being manipulated based on my so-called algorithm choices...
It may seem like a pretty logical step for Netflix to target those interested in watching films with, say, black actors in them, with films that also contain black actors.
And @jeffwetherell complained: "It's not marketing". This in turn, she suggests, is duping users into thinking some movies and TV shows are more diverse than they actually are. "You watch the first 5 minutes then realize it's not what it claims".
In its statement to Newsbeat, the streaming site said that "reports that we look at demographics when personalising artwork are untrue".
Netfix told Newsbeat: "We don't ask members for race, gender or ethnicity so can not use this information to personalise their individual experience".
"So we can not use this information to personalise their individual Netflix experience". In terms of thumbnails, these do differ and regularly change.
"We are always trying to learn from our members and looking for ways to improve how we personalise the service over time".
Netflix has, in the past, been upfront about its use of personalized artwork.
"The artwork may highlight an actor that you recognize, capture an exciting moment like a auto chase, or contain a dramatic scene that conveys the essence of a movie or TV show", explained Netflix's Ashok Chandrashekar. "I am black, give me black entertainment - don't take something that isn't and try to pretend it is".
Picking something to watch on Netflix can be tricky at the best of times.
Netflix will also track your apparent enjoyment of particular actors for the same goal.