y'know the thing of "he would not fucking say that". that but with martin in a negative way. the fucking. "sorry I can't hear you, there's a door in the way" is such an iconic line. but it doesn't fit his character at all. like. who the fuck is this self assured witty guy.
I can see where you’re coming from, but I disagree. I’ll try to explain as best as I can.
One of the things Martin cared about more than anything else was being seen as caring. He tried very hard to put himself into the role of a sweet and helpful guy not only because he cared about his colleagues, but because he felt safe that way.
Making them tea was a simple gesture, so much easier than trying to offer a solution or talk about a problem they had, but it still showed that he cared and put in effort. He avoided conflict because he’s bad at resolving it. He’s the kind of guy to pretend an argument has never happened, cause it’s easier to brush it off and forget about it rather than try to get to the root of the problem. Later on, he admitted to putting on this quiet sweetheart persona while simultaneously keeping people at a distance because loneliness is easier, safer than opening yourself up to someone and showing vulnerability. He kept his interpersonal relationships surface-level because it was easier to maintain them that way.
That moment you mentioned, the action of locking himself in the archives to burn statements, and throwing a snippy response at Elias instead of folding and apologizing seems to me like positive character development - Martin finally choosing a stance in a conflict instead of trying to find a blanket solution or an easy middle ground. Finally doing something he believed mattered, and not just to keep up appearances for his own comfort. That development is very clear later, when he made the decision to collaborate with Peter Lukas because he believed he could ‘help’ his colleagues that way.
So to sum up, I don’t agree with you. I think that line is very much fitting.