How much do you like a person who loves the brands you hate? We investigated an effect we call the brand negativity bias, which occurs when an unfavorable brand reduces the attitudes toward an associated target product or person. Using a person perception paradigm in the context of brand placements, Experiment 1 established that unfavorable brands reduced attitudes toward a new digital product (i.e., a movie) in which the brand was placed. Experiment 2 showed this effect was driven by a reduced ability to connect with the character in the movie who was associated with an unfavorable brand in two serial processes (lower perceived similarity leading to lower empathy). These results provide the first evidence showing how unfavorable brands can reduce empathy between people. Supporting the brand negativity bias, we found that unfavorable brands yielded stronger effects across every evaluative outcome suggesting that unfavorable brands held more influence over consumer judgment compared to favorable brands. Lastly, these results add a layer of complexity to B2B partnerships and tell a cautionary story of when unfavorable brand associations transfer between entities.