The pseudo-scientist and anti-relativist Mohammad Shafik Khan proposed an open challenge, which can be found here: Poster OPEN CHALLENGE
Here is attached my response to his challenge.
Now is my turn: I challenge him to point out a single mistake in my rigorous derivation of the Lorentz transformation that he is criticizing: https://youtu.be/6N2mH3-khUg
Let us all admire how he is going to flee.
P.S. 1: Claiming that the 2nd postulate is "wrong" is not acceptable, since it is an experimental fact and, as a result, there is nothing you can do against it.
P.S. 2: For those who are curious about the character, his biography is available on my website, here: https://bluemoonshine.fun/Project-Pseudo-Scientists-MohammadShafikKhan.php