It is all in the details. If by Gravity being a proven Law you mean that an apple will fall down off a tree growing in the soil of our planet, then at a certain level of detail you are correct. But at other levels of detail, you are not. Physicists have a lot of fun trying to ascertain exactly how it is that Gravity works, and whether all particles participate in the same pattern regardless of place or time. So in that sense, the Law of Gravity is a theory that is handy to explain how things happen.
The Theory of Evolution presents a similar problem... at a certain level of detail it is undeniable that change occurs and that these changes together create unique adaptations and manifestations which over time give some advantages to particular individuals within a population. However, at a broader level, the description and application of this theory to the particulars of biology across multiple forms of life contains many aspects yet to be discovered, expressed, and proven. Sometimes people use sound-bites to express themselves, when they shouldn't.
But this is still a train-wreck, and I can't believe I stopped to rubberneck.