Learn to distinguish between someone who has uncompromising moral standards and is brave enough to stand up for them in the face of attacks and threats from very scary dangerous people, and someone who enjoys hurting other people. It’s true that sadists and power-hungry people often masquerade as justice-seekers. It’s your job to learn the difference in behaviors. One difference is the second is more likely to be pleasant to you if you’re “important” in some way.
The person who is equally grating and annoying to the admin of a powerful instance, some nobody on the internet, and a person who is used to receiving politeness and respect due to their privilege is more likely to be someone doing good work that benefits society than the person who is pleasant to only the powerful and privileged. So if you have some privilege or power, take a hard look at your own preferences and biases towards people who make you feel good.