The 'otherness' in this regard is specifically with respect to religion/race/nationality, making the Nazi comparison even more apt.
Just saying "the other political side will be terrible for our country" is not fascism, because yes, everybody does that.
That would make everybody Nazis forever. Different groups have different outgroups.
http://slatestarcodex.com/2014/09/30/i-can-tolerate-anything...