Historian: Those who claim that Shakespeare did not write the plays commonly attributed to him are motivated purely by snobbery
Shakespeare was the son of a glove maker, whereas every other person proposed as the true author of the plays was an aristocrat, and many of those who argue that one or another of these aristocrats wrote the plays are the aristocrats' descendants
presumes, without providing justification, that a claim cannot be true if those who advance it are motivated by snobbery