Relative velocity & other concepts like gravity & reaction vs action are a bit different concepts. The above example is just an implication to embose one niche of radical dumbheads... tru there can be & there should be arguments against a theory then only the application of it can be rectified. however there has been many conspiracey thorist like this in the past as well but they just keep talking... noting is proved.
I challenge Einstein with his E=m(C)2 , cos energy will never produce mass. If there are any Elakirians who like to have a constructive debate on this... cum forward.