Relativity defends itself by complicating everything to the point of incomprehensibility.

"The establishment defends itself by complicating everything to the
point of incomprehensibility." - Fred Hoyle
However, the errors of relativity are very simple, elementary, and
obvious.
1. Petitio principii:
Many unmistakable examples of Einstein making this logical error have
been correctly pointed out all along. A very good one is the train and
lighting bolt thought experiment which presumes time dilation to
conclude the same.
2. Reification fallacy:
3.