Gullivers travels

I found the last trip that Gulliver went on to be a little disturbing. Especially the part when he finally gets home. He hates everyone so much and no longer refers to humans as such but calls them Yahoos.  He also neighs as he speaks and since he hates everything that looks like a Yahoo he is disgusted by his own family. There’s probably some reason he ended it the way he did but I don’t know what that reason is.