President Trump has more than enough on his plate at the moment without going out of his way to make enemies of the Saudis. He needs to take care of the the enemies within first and foremost.
If he is able to fully advance US energy self-sufficiency and then oil self-sufficiency then the game changes, not to mention the Sauds are necessary for any Middle East resolution.
Until then I'll accept President Trump being polite when he visits. Others will continue to find fault with everything he does and says no matter what the venue or circumstances. Each to their own.