I doubt that anyone would see this as a negative and many would see it as somewhat, though not profoundly, positive.
The TA experience varies. For some, possibly most, it involves grading and leading question and answer sessions for some portion of a course's students. At the other extreme, once experienced in the above a person might actually have responsibility of teaching a section of a popular course. In math this can happen in the later years of a doctorate, for example. The latter is a much more positive contribution to your CV, but probably less important in a separate field.
However, experience in dealing with students and seeing the complexities of managing the learning of others is a positive thing for those wishing an academic career. And, of course, if your field is, itself, interdisciplinary, then the benefits are greater and more positive in the CV.