First of all, none of them were actually communist. They were probably actually closer to fascism.

I think, however, fascism is a much greater insult for three very simple reasons. I) We've been to war with fascism. II) We associate fascism with Nazism. III) They're associated with monolithic, overbearing governments and fanatical racism.

When you look at things like Stalin's regime you see something somewhat ramshackle, less threatening and simply not as fanatical.

I'm not too familiar with the hipster talk that you Americans use, but other than the meaning behind the words I can't say much more.

Being called a communist means that you're a passive person imo. You want everyone to have equal power and such, which is  utopian socialism IMPOV.

A fascist is someone who values that strong people should rule over weak people, and thus it can be used for many people as that is how humans work. There's just that it's more like a disco ball, and different strengths shine at different angles.

Edit: This means that fascism can be used to tell someone that they're overpowering something/someone/some ones, and that is frowned upon in our society.

A shy smart guy that says that he's not that smart, but that he just spends his time reading books is seen as someone nice, whereas a smart guy that says that he reads a lot of books while you're goofing about when asked the question of how he knows stuff is looked down upon, and often times even met with hostility.