There is a huge difference between a head butt because you are leading with your head and jumping off the ground to try and head butt someone. How would Arce react if the guy jumped off the ground to head butt him intentionally rather then just having a clash of heads.
If anything, Nongqayi shows Ortiz how to handle a point deduction: you get to the neutral corner, don't move until the ref tells you to, and fight with urgency. To be (un)fair, Arce was pushing against the ropes with his head, in the 3rd. Besides, Ortiz probably billy-goats his way downstairs, eats fouls like Nonggqayi's for breakfast and sucker punches the cook.
yeah lots of honor. Mexicans dont headbutt when theyre frustrated and down 4 rounds and then hug and kiss to run down the clock to avoid retaliation. They dont load their gloves either. Honor system.