Nobody agree with Einstein and few with Copernicus before they published there work, but both were able to convince many mainstream scientists quite rapidly. In Copernicus's case not a majority, but to be fair he was fighting political oppression that doesn't exist today. And despite his theory's elegance (and ultimate truth) it was less successful at predicting the positions of planets in the heaven's than the overfited theories of his opponents with their epicycles. It wasn't until Kepler figured out how planets actually moved in ellipses (not perfect circles) that heliocentric theories provided superior experimental predictions to geocentric ones.

This is a list of potential red flags. The vast majority of people making claims that aren't accepted by mainstream science are wrong. The small percentage that are correct need to convince the scientific community before presenting at a conference like TED or TEDx.