Also a theoretical physicist now?

It's rich that you think you can dismiss one of the most well-established and experimentally confirmed theories in physics with an uninformed declaration 'relativity of any kind also does not exist', clearly shows that you do not realize that only a select few possess the intellectual capacity to grasp the complexities of Einstein's theory of relativity. In fact, your statement is a perfect example of the Dunning-Kruger effect, where someone with limited knowledge and understanding overestimates their own abilities and dismisses the expertise of others.