That's not how tariffs work.
Tariffs placed by the USA on incoming goods are paid the by the person or company in the USA who is importing the goods. That additional cost will be added to the total price of the goods. The people buying the goods... US Consumers... ultimately pay the tariff. Americans will pay more for imported goods.
Thailand reducing their Tariffs on US goods means that it becomes cheaper for Thai importers to import US goods. Thai consumers will pay now less for things imported from USA.
Trump is trying to use the tariffs to effectively make "Made in the USA" products cheaper, driving up demand for them, and encouarging more manufacturing in the USA.
He may or may not be successful.
But it is going to be a painful process to transition to this new global order for trade. The "old" global supply chains meant that components for cars, airplanes, electronics and other advanced manufactured goods, would be sourced from all over the world. Those components are now subject to tariffs... making even products "made in the USA" more expensive, until supply chains can be adjusted to minimise costs in Trumps new world.
Americans are not the only ones hit of course. These tariffs, and the increased prices American consumers will need to pay, means demand will drop, and other countries will take economic hits.