It’s fair enough if you’re okay with choosing your words more carefully and he’s willing to be understanding that you don’t speak the exact same way that he does and sometimes he needs to focus more on what you clearly mean to say as opposed to your exact words. I mean this lightly, but he’s being a pain in the ass. It’s okay, we all are in some way. I also prefer that my girlfriend not generalize or exaggerate or words things inaccurately. Sometimes, it even bothers me enough that I ask her to clarify by being more specific or I correct something she says that’s inaccurate. Unless it is because I genuinely don’t understand what she is trying to communicate and am asking in order to facilitate our communication, or I think she doesn’t know something and would be interested in learning, it’s rude for me to do that. It’s okay for me to have preferences for how people say things. I can even have feelings about whether or not other people say things how I do or how I want them to. But it’s not cool to try to control how other people speak. That’s a me problem. She can accommodate my preferences and change how she words things but she doesn’t have to because I know what she intends to communicate and my wanting her to be accurate is me being controlling.

You can compromise and be mindful of how you say things, but his insistence on you doing that to prevent him from being triggered is low key controlling. If he doesn’t have a tendency to be controlling otherwise, it’s pretty benign as far as things like that go.