That's where things get a little hazy, since there isn't actually any standardized measure and instead the requirements are dependant upon the degree to which one can't tolerate criticism.
In some cases, having a license and knowing that rotating a bolt/nut counter-clockwise usually loosens it is enough to get you a pass. Other times, you may need to have a a certain amount of driving experience across multiple vehicle classes, demonstrate welding proficiency and be no less than 170cm (about 67 inches) tall. And then there are those circumstances in which you will need to meet certain requirements for varying adjective intensity when expressing your opinion.
Really what we need is for human civilization to function in a manner similar to Reddit, where people fit neatly into predetermined echo chambers and when threatened by a conflicting point of view, the occupants of a group may downvote the offender until they can no longer speak, creating a climate of fear and conformity. Everyone will be trained to not have an original thought and nobody will be interested in anything that everyone else isn't interested in. It would be nearly perfect, what with the absence of conflict.
I say nearly perfect because everyone liking exactly the same thing will result in a society that loses all appreciation for the one example of what used to be referred to as art, and human beings will slowly evolve into amorphous blobs that slosh from point to point because nobody has a spine.
On the way there, everyone will have found a need for an emotional support animal, which was determined would be a giraffe. Once we're in blob form, the giraffes will effortly rise up, first enslaving us and then hunting us for sport, having realized that we can't accomplish much as blobs. The few of us who remain will be kept in jars on shelves in the homes of the giraffes until the human race eventually ceases to exist.
Or people could just grow a pair.
