Is the use of “Jawohl!” offensive to yall Germans?

American here, been dming a girl from Germany and I used the term "Jawohl". I've heard it in movies and I think it sounds badass. To my understanding, it means something like "certainly" or "yes, indeed" but ever since I used it she's completely ghosted me and has done other things that make me think I wronged her. I did some more research and apparently the word has negative associations with the Wehrmacht. Is this true? Did I mess up by using this term? Danke Schön!