I recently had an initial phone screen interview for a lead software developer role (the interviewer would have been my boss if I landed the role). During the phone screen I was describing a custom software tool that I had helped implement and was using at my current employer. After describing the tool I asked if it was something he was interested in, but I don't remember if I said: "would you be interested in something like that?" or "would you be interested in that?" After I asked him, he just bluntly said "No." and then there was an awkward silence. In retrospect, I think he thought I was saying that I was going to steal code from my employer for this custom tool so that it could be used at his company. Is it probable that this was the case, and if so, how could I reword what I said? I have no intention of stealing any code. What I was trying to impart were the concepts/use cases and asking if they applied to his situation. This custom tool is too specific to my current employer's situation to use much of any code from anyways.
The rest of the phone screen was fairly typical Q&A about what the interviewer is looking to accomplish in the future in regards to refactoring their codebases and processes and how my experience relates to that. Not the worst phone screen I have had, but don't have good vibes about hearing back about an on site interview.
If the interviewer automatically assumed I was asking if he wanted stolen code from my current employer, is that a red flag in any event?