Digital Restrictions Management is a backronym popularised by the EFF, but DRM is the actual legal term used in the US, and doesn't necessarily carry a derogatory meaning.
I disagree, DRM actually is seen as an extremely negative thing. Perhaps people who work to create DRM don't think it's a negative but saying someone's work is DRM is actually a pejorative statement.
taking my BMW to the shop to do a DRM delete
I don't know, I've never happily acknowledged the existence of DRM. I'm from the US and, as far as I can tell, I and people in my periphery see it as a negative and use it as basically "This f-ing DRM is always preventing me from watching my movies in 4K even though I paid for 4K" kinds of situations
I used to never curse. Apple TV HDCP DRM was the first time.