You’d never cite a random comment in a research paper. Don’t cite it about yourself either.

You already apply standards to evidence in every other part of life. A claim from an anonymous stranger with no knowledge of the subject would not survive ten seconds in any argument you took seriously, yet the same claim about you gets accepted immediately and quoted for years. The difference is not the evidence. It is that you were the subject.

Apply your ordinary standards to statements about yourself. Ask who said it, what they actually know, and whether anything supports it. Most of what you carry would not pass the test you would give anything else.