Should the fluid (discharge) pray in another mosque or abandon the imamate, and was the action of the man who prohibited him from leading the prayer correct, knowing that he (the fluid) is more entitled to the imamate?

If you are the most knowledgeable of the Qur'an among the people, then you are most entitled to lead the prayer, as the Prophet, peace and blessings be upon him, said: "The one who is most knowledgeable of the Book of Allah among the people should lead them in prayer." However, if your leading the prayer would cause discord or harm, then step back, out of consideration for the benefit of the congregation, and pray behind whoever comes forward. Do not abandon praying in your village mosque because of this incident. Try to speak with the man and the congregation calmly to explain to them that the Sunnah dictates that you lead because you are the most knowledgeable. If doing so would lead to harm, then be patient. Beware of loving to be in the forefront and to lead, and the desire for prominence. Let your motivation be to apply the Sunnah of the Prophet, peace and blessings be upon him.