Many accuse the Shia of racism (especially against black people) because of misunderstanding specific narrations. If you just type racist/racism in the subreddit search bar you will see the amount of posts related to this. Of course, these have been responded to multiple times in different ways. But I couldn't find someone who brought up this narration that I will share, perhaps it was missed.

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عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عَبْدِ اللَّهِ بْنِ الصَّلْتِ عَنْ رَجُلٍ مِنْ أَهْلِ بَلْخَ قَالَ كُنْتُ مَعَ الرِّضَا (عليه السلام) فِي سَفَرِهِ إِلَى خُرَاسَانَ فَدَعَا يَوْماً بِمَائِدَةٍ لَهُ فَجَمَعَ عَلَيْهَا مَوَالِيَهُ مِنَ السُّودَانِ وَ غَيْرِهِمْ فَقُلْتُ جُعِلْتُ فِدَاكَ لَوْ عَزَلْتَ لِهَؤُلَاءِ مَائِدَةً فَقَالَ مَهْ إِنَّ الرَّبَّ تَبَارَكَ وَ تَعَالَى وَاحِدٌ وَ الْأُمَّ وَاحِدَةٌ وَ الْأَبَ وَاحِدٌ وَ الْجَزَاءَ بِالْأَعْمَالِ.

1. A number of our companions, from Ahmad Bin Muhammad, from Abdullah Bin Al-Salt, from a man from the people of Balkh who said: I was with Al-Ridha (asws) in his (asws) journey to Khurasan. One day he (asws) called for the spread (for a meal) to be set up for him (asws). So there gathered around him (asws) his (asws) black friends and others. So I said, ‘May I be sacrificed for you (asws), if you (asws) could isolate the spread for these people’. So he (asws) said: ‘Muuh! (Shhhh!). The Lord (azwj) Blessed and High is One, and the mother is one, and the father is one, and the Recompense is by the deeds’.

- https://thaqalayn.net/hadith/8/1/296/1