This is not how that works. Juncker was the PEC candidate for the European People's Party, which had the largest count of MEPs after 2014, and consequently had the first crack at obtaining majority support. He then secured preliminary majority support in the European Parliament, at which point the member-states of the EU had the chance to exercise what amounts to a veto; when they did not, instead endorsing him by 26-2 (Cameron and Orban against), it was put to a full vote of the European Parliament, where he won handily.
It's similar to how Theresa May was the only candidate for PM because she was the leader of the largest party in Parliament. They didn't hold a vote in Parliament on whether Farage should be PM? Tyranny!
Moreover, you are again demonstrating how thoroughly democratic and respectful of the rights of the involved member-states the process is. Juncker was chosen in a free and fair election as the candidate for his party. A free and fair European election was then held, in which his party emerged with the largest share of both seats and votes. He then formed a working agreement with the second-largest party in the European Parliament, providing him with what amounted to a loose majority coalition for his election as PEC. As a further check and balance, the member-states were given the chance to ratify that choice, and did overwhelmingly, at which point a free and fair vote was conducted within the Parliament itself, which Juncker took at a canter.
