I only care about facts.
Fact no. 1
capitalism is superior to socialism
Fact no. 2
fascism is left wing
so if you are a leftie and "want to show that conservative/rightists" calling him a fascist isnt gonna work. however you can call yourself a fascist.
Fact no. 3
nacism, national socialism is both left-right ideology that combines ideas from both worlds. therefore calling someone a nazi doesnt mean far right extremist.