For sure, but insults are just (nicely crafted in this case) words, and unless the insulter is in a certain position, they ultimately don't affect much. It's not like Simon's statement is going to change Baltimore policy or shipping or things for the citizens, or Greene's actions. And it's not like Greene will be able to make funding decisions about Baltimore or declare war on the city.
Like, I enjoy some dramatic shit-slinging, but I wish "news" were more about objective things happening than someone expressing an opinion on social media that doesn't have any obvious real consequences for anyone.