 We investigated the effects of two different hashtag combinations, hashtag Black Lives Matter and hashtag All Lives Matter, on the perceptions of tweets by U.S. participants. We found that people on the political left were more likely to interpret hashtag All Lives Matter tweets as racist and offensive, while people on the political right were more likely to interpret hashtag Black Lives Matter tweets as racist and offensive. Furthermore, political identity was a stronger predictor of evaluation results than any other measured demographic. To further explore this phenomenon, we also tested whether the hashtags themselves influenced the perceptions of tweets. We found that when the hashtags were removed from tweets containing them, the tweet was evaluated differently depending on its original content. This suggests that the hashtags themselves may be influencing the way people interpret tweets, rather than simply serving as a marker of their political affiliation. This article was authored by Maya Powell, Arnold D. Kim and Paul E. Smaldino.