I've been playing MMORPGs since they were a thing, and I've always believed that behavior like this should come with consequences.
Sadly this problem has only gotten worse and most developers seem to be taking an increasingly passive stance on it.
It's especially bad in FFXIV since it's virtually impossible for the community itself to regulate this kind of behavior. In older games if you behaved this way to everybody you met, you would earn a reputation and not be welcome in most parties. It meant that toxic people like this would have to control themselves a bit if they wanted to participate. Now, with DF and other systems, these people can just summon up a new handful of people to use and abuse at their leisure with no lasting repercussions.