I would expect the Thai person to be thrown in prison, but it depends on the wealth of the attacker. If it's a poor Thai they might even get harsher punishment with longer lockup time, but if they're wealthy they can afford better lawyer and might get off lighter. That's just the realities of adversarial justice systems. With a foreign convict, again it depends on the wealth, but theres the added dimension of deportation, but that's true of any crime commited by non-natives in countries not their own. As for the media outrage part, it depends if the media picked it up to begin with, Thai are some of the most active on their social media so I would expect outrage, but it would be directed more at the individual since there's no option to deport.