I promise that if you took a group of NIMBYs and proposed tearing down 5 single family homes to build a midrise apartment building they'd object. But if you also proposed—to the exact same group of people—tearing down a mid-rise to build 5 single family homes, they'd object.
If you propose to remove 50 parking spots for a bike lane, they object. If you propose to remove a bike lane to replace it with parking, they'd object too.
These people are driven by a deep cynicism that anything can be made better: they don't believe people could consciously want to make things better, and they don't believe that ungided "forces" can make things better either.
If something has an advocate, the advocate must be taking advantage. If nobody is advocating, then something unguided must be wrong. Nothing can be an improvement.
Therefore, any change must be for the worst, and they oppose everything.