On one hand, yes, these people are pathetic and have little idea what the symbols they’re playing with truly mean beyond white supremacy. And yes, it is useful (and fun) to mock farcists.

On the other hand, some of these people are (literally) astronomically rich, in bed with leaders of one of the most powerful military forces ever to exist, and the others are those supported by these rich haute-booj oligarchs (just like the original Blackshirts and Brownsharts were supported by landowners and maginates). A Nazi salute, understood with respect to history and the powerplay of today, is personal to many people. If it’s a teenage edgelord fucking around to get a reaction, sure, dismiss them or let them ‘find out’, but Musk and Bannon are people with huge influence over politicians and mass media. Elon Musk, for example, literally owns a pervasive media platform. They can start sizable rallies gathering both the batshit unhinged and the ideologically driven, armed and hungry.

So if you’re someone who the Nazis would have sent to the extermination camps (and there are many, many groups that were, basically most of humanity), then that salute is someone with state power declaring they want you dead. I wouldn’t call it insulting as much as a credible death threat.