Shatnez is observed by thousands of people today. It is bizarre to you because you are cocky, you think you are so smart and can pick away at the unsophisticated Bible. If you took time to really study this stuff, I can tell you that Shatnez is one of the deepest and most profound rules in the Torah. But anyways, if one really believes in the Torah and that God gave it, is it so stupid to follow it just because we trust that there is a good reason, even if we don’t understand it?
I’m sure that sounds childish to you, because it is clear from reading your stuff that you look down on religion as being silly and meaningless, but I find it very profound and significant.