It's derogatory in the sense that it reduces an issue that a pro-life advocate believes to be a matter of life or death (with concomitant importance) to being a contrarian to someone else's (presumably standalone and considered) opinion.

For a pro-life advocate, the issue never descends to the level of choice or anti-choice, in the same way that deciding whether to kill your mom is right or wrong no matter how inconvenient she is. It's obviously wrong, and saying that opposing the killing of your inconvenient mom is a matter of choice or not is absurdist.

Does that help clarify matters?