I think people just need to respect other users.
If adding a new [vernacular] name, then the only “requirement” I think applicable is to have a reasonable understanding of the taxon enough to recognise whether a vernacular is “in-use” widely enough to be considered to be the most used one.
Outside of that, and especially for when changing an existing vernacular in the system, I think you have to have a good handle on how other people might be using it. If someone is getting upset that you changed it, or it’s creating “name wars”, then you have quite clearly come up short in that regard, and if it were me in that situation I would immediately pull back from the situation and “do the research” to ascertain a clearer picture of what should be applied, complete with links to sources (primarily to make it easy for others to review the same material, but also to support my position). And even then, preferably via discussion in a flag rather than tug-of-war in the applied name.