Quite understandable, see for example the price that you pay for a Ford Ranger in the USA, compared to the price that you pay for the same car in Thailand.
Double >++
So 49% doesn't seem that excessive, if it's similar with other imported goods.
It just seems that Thailand already had tariffs in place for a long time but hasn't talked about or hasn't been in focus of the mainstream media like these new reciprocal tariffs announcements.