Jerusalem was, at that time, the Mother of all the Churches; for the Gospel had spread from it over the whole world, and it might be said to be the principal seat of the kingdom of Christ. Any one who came from it into other churches was received with due respect. But many were foolishly elated with the thought that they had enjoyed the friendship of the Apostles, or at least had been taught in their school; and therefore nothing pleased them but what they had seen at Jerusalem. Every custom that had not been practiced there was not only disliked, but unsurprisingly condemned by them. This peevish1 manner becomes highly pernicious, when the custom of a single church is attempted to be enforced as a universal law. We are sometimes so devoted to an instructor or a place, that, without exercising any judgment of our own, we make the opinion of one man the standard for all men, and the customs of one place the standard for every other place. Such attachment is ridiculous, if there be not always in it a mixture of ambition; or rather we should say, excessive peevishness is always ambitious.
John Calvin, from his introduction to his commentary on Galatians (emphasis mine).
easily irritated, especially by unimportant things