I'm a resident at Baylor (though not in IM), and I was a student there, so since no one else has answered your question, I'll take a stab...
Overall, I don't feel like the IM program is malignant in the terms that you are asking. When I do my off-service rotations in IM, I'm always very impressed by the general rapport and collegiality of the residents - most of the classes get along very well and work together very well. Most of the attendings that I've worked with have been great - they enjoy teaching, and really want to help you improve your skills and knowledge base. There are a few bad apples here and there, but I truly think they are the minority. The ways in which I think Baylor is malignant is mostly to do with the volume and hours - it makes everything that much harder, and I think as a result, I know some residents complain about having their schedules tweaked, what were supposed to be call-free months suddenly changed to have call, etc. However, you will learn a ton in this program and be surrounded by some truly excellent people.