Bedrockgames
I post in the voice of Christopher Walken
A player who gets outright upset because of something so mild as "it's worryingly close to the line"--necessarily an emotional description, but descriptive nonetheless--would be extremely tedious to actually interact with at the DMing table.
You can't describe anything as beautiful, frightening, awe-inspiring, freaky, enraging, unsettling, revolting, pleasant, etc., because that's ascribing a mental-emotional state to the observer, which means you're describing what they're thinking.
I would agree with you if someone is being a jerk about it, it is annoying. I am fine with people not liking a GM telling them what they think. And I think there are reasonable ways to address it during a game if it is becoming a problem. But a GM also speaks the way they speak and some might use language that feels like it is trodding on what characters think and feel. If so, that can be a hard habit to check, and as a player I find few things as annoying as "Don't tell me what my character thinks" said in an irritated manner over a well intentioned descriptions. So I don't necessarily disagree if I understand your meaning. I do think though when you are GMing things in this POV way, you are going to refrain from using langue like that assumes to much about what the characters feel because your role is presenting what they sense