Let me see if I can help here because I do speak a little cracker:
The problem is not that you're somehow wrong that "nazi instances exist and nazis create new ones all the time," the problem is that you didn't have to respond at all and certainly not in a smug-ass way that directly implies it's Black people's FAULT their replies are getting carpet bombed by internet nazis posting racial slurs. You're prioritizing your feels about fedi, over their need to share their lived experience re: racism