So, the Houthis are instituting a blockade. Sometimes a blockade needs to be enforced. Is doing that a terrorist act? If so, America is a larger terrorist in this regard (see Cuba for a single example), and Israel blockades the entire Gaza strip. Unless your entire world view is "we can do anything to them, and they can't do anything back", you'll have a hard time with hand wringing about one over the other.

The Houthis blockade is for a just cause in my opinion, so frankly they have a higher moral standing.

And you brought up the flag again... Here. Norm Finklestien says it better than I ever could. https://www.reddit.com/r/Hasan_Piker/comments/1g5jv2u/norman_finkelsteins_response_on_the_houthis_slogan/