No, rejecting the dispensationalist view does not make one anti-Semitic. However, this action, and others, of the PCUSA, a Reformed Theology denomination, is the result of anti-Semitism in the leadership of that church IMO. Any organization that condemns and economically punishes Israel for defending itself against fanatical Islamic terrorism is in the anti-Semitic "boat" AFAIC.
I emphatically reject any doctrine that claims God's promises to Israel were not unconditional and eternal, but I can still fellowship with other Christians who hold to that doctrine. What I can't tolerate or compromise with is the notion that the modern nation of Israel is an alien intruder on Arab lands. That false premise is clearly contradicted by history and by God's own word. Any organization or nation that persecutes Israel or the Jews in general is poking it's finger in God's eye, and history is littered with the wreckage of those nations which have done so.
"I emphatically reject any doctrine that claims God's promises to Israel were not unconditional and eternal,"
Your statement begs the question of whether the Israelis of today do indeed represent the Israel of the Old Testament and therefore are the inheritors of the covenant promise. The New Testament indicates that the Church is the inheritor. Judaism began a great split with the coming of Jesus. Those who accepted him became the Church. As for those who rejected him, Jesus had some harsh words:
John 8:39-45 They answered and said to Him, "Abraham is our father."
Jesus said to them, "If you are Abraham's children, do the deeds of Abraham. But as it is, you are seeking to kill Me, a man who told you the truth, which I heard from God; this Abraham did not do. You are doing the deeds your father."
They said to Him, "We were not born of fornication; we have one Father, even God."
Jesus said to them, "If God were your Father, you would love Me, for I proceeded forth and have come from God, for I have not even come on My own initiative, but He sent Me.
"Why do not understand what I am saying? It is because you cannot hear My word.
"You are of your father the devil, and you want to do the desires of your father. He was a murderer from the beginning, and does not stand for the truth, because there is not truth in him. Whenever he speaks a lie, he speaks from his own nature; for he is a liar and the father of lies.
"But because I speak the truth, you do not believe me."