Did you tell them it's because Thailand is a sleazy, corrupt country with grossly unequal wealth distribution and therefore attracts lowlifes from all around the world? That would have tested their whole "we're more peaceful than you" facade right quick 🤣
The initial Non-Immigrant O Visa is for 90 days, not 3 months.
After that you get a 12 month extension of your permission to stay and can protect this with a single re-entry permit (฿1k) or multiple re-entry permit (฿4k). It is NOT a "12 month multi-entry visa".
Re-entry permit is not required if you have no intention of leaving the country before the end of your permission to stay.
I hope you're aware of all the pitfalls of using an agent to dodgy you up a "retirement visa". If not then best DYOR before diving in. The pros and cons have been discussed at length here on AN.
I didn't "attack" you, I simply provided an example of why you're not as smart as you claim to be. You didn't prove your point with the above reply, if anything you've made your detractors' case for them.
You didn't know that French passports have addresses on the photo page and you didn't look it up before replying to the French chap who mentioned it the other day, so you can't be that smart.
Also, not many people like a FIGJAM.