Compulsory alliance is sort of a core feature of fascism so you really must be either fascist or anti-fascist.
If fascist government is in power, it will creat a system in which non-partisan participation furthers and advances the fascist state, so one cannot “opt out”. Since a fascist system won’t entertain neutral, the question “Are you fascist or anti-fascist? You can only pick one.” Is not inherently disingenuous.
Communism does not force people into supporting it, there “neither” is an acceptable answer to “Are you communist or anti-communist” in a way that cannot be applied to fascism.
Well, Communism doesn’t force participation as long as you don’t ask the tankiis, but fuck the tankies.