I think you (and RationalWiki) are being too sensitive.
The term "evolutionist" has a reasonable dictionary definition. It doesn't, to my ears, contain any inaccurate or slanderous content.
It is a big step up from the alternative "Darwinist" (which implies the theory hasn't been developed since the works of Darwin).
I am aware that words that sound innocent may be imbued with negative meaning - c.f. the way words for minorities, including the disabled, morph over time as each variant is adopted as a slur and rejected. Evolutionist doesn't (yet?) have such a connotation to me.
Simply calling proponents of evolution "biologists" or "scientists" is begging the question. If the argument is that biology is divided over evolution and creationism, then evidence needs to be provided that virtually every biologist accepts evolution. (e.g. Project Steve) It isn't enough to simply declare that scientists accept evolution.
If Richard Dawkins, Stephen Jay Gould, PZ Myers and Niles Eldredge call themselves evolutionists [Ref: RationalWiki), I think Skeptics.SE questioners may too.