Is this as inappropriate as I think it is?

I had a rheumatologist appointment I can't stop thinking about. Dude tells me I don't have lupus, which is what I came to find out. Awesome. Thanks. Then he tells me my back pain would greatly improve with walking. Yes, perhaps... If I could walk any distance without being in excruciating pain. I tell him this. He says he'll send me some articles. I was thinking maybe ways to make walking a lower impact activity, maybe? Sure, whatever. No, he sends me some shit about how beneficial it can be, and "though it may be hard to stick to an exercise program, you can do it!!"

Ok doc, sure. You walk, I'll stab you in the lumbar, let's check the benefits at the end. (:

What in the inappropriate, ableist bullshit..

Or am I misreading the situation?