I don’t think it has anything specifically to do with nazi symbols, it’s probably more about how you state things. The way we communicate is not easy interpret online. People type things in a manner that can be misinterpreted. For example, if you are lazy and want to speak directly, you could leave out most words and it will sound rude.
Don’t know about your specific comments, but Nostr attracts all sorts of people - some of whom will be hardcore pro-any-speech. To them, yelling fire in a theatre of people or bomb on the plane is acceptable speech. No amount of arguing will convince them that this is not appropriate and that we have norms for things we don’t say IRL which should not be said online either.
In a way, they are justified in a sense that nobody should be silenced or banned from any platform. It is a digital right at this point. Getting banned on one platform can cut you off from essential communication. But, that doesn’t mean they should be heard. Speaking, and being heard are two different things. You can speak your mind, but if you say vile hate speech racist homophobic transphobic and all-kinds-of-phobic crap, people shouldn’t have to see it. We isolate ourselves from these kinds of people IRL, so we should be able to do the same online.
The issue is that the people who are hardcore “all speech is fine” and you need to be less sensitive, tend to be white older male who have never had to deal with any sort of discrimination in their life. They also don’t understand that you can actually have it both ways. You can say whatever disgusting shit you say, and people can opt out of your verbal garbage without you getting banned. It’s just too hard to think 1 step beyond “they gonna ban me!”. Or so I assume, otherwise they would not object.
Tools will be developed to deal with this in one client, or another. It’s just a matter of time. This is the consequence of being early. Knowing why people get triggered to defend even the most absurd things, one solution is to simply not engage in those conversations.