Have no fear, there is no alt-right in the Catholic Church. There are orthodox Catholics, those who accept the Catechism, Holy Scripture and Holy Tradition. There are also many Catholics who disagree wholeheartedly traditional Catholic teaching, the Catechism and the Church's interpretation of Scripture substituting for it either the opinions of dissident theologians or their own innovative theories.
They label orthodox Catholics as 'alt-right', 'trads', 'über-trads' and more mildly 'traditionalists' and 'conservatives', the latter being a term usually applied to political parties. They do this in much the same way that left-wingers label those who disagree with them as 'fascists', nazis', etc. 
I can understand your disappointment and sadness but have  no fear, orthodox Catholicism will prevail. Our Lord said, ".... and the gates of hell shall not prevail against it [His Church on earth]."
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