Pattaya is quite far from Bangkok. It has its own floods from heavy rains (not from the sea) but is a resort as you say, so if it floods it’s just an inconvenience.
Bangkok though, is the commercial, industrial and financial heart of Thailand. If it becomes impossible to move freely (and I use the word loosely, given the horrendous traffic there) around the city and the infrastructure is seriously affected with power outages, for example, then that affects everyone.
Toyota is shut down, which will affect all of SE Asia. Seagate has some serious problems which will mean a shortage of hard drives, including in the USA as this is a huge plant that supplies international markets.
Locally, foodstuff stocks in the grocery stores are down (my guess) around 40%, especially butchered products - mostly pork.