Opinion: Don't go to Thailand in high season

TL;DR: going to thailand in high-season not recommended, and have it price

I see a lot of people asking about rain in low-season and preferring to go in high-season because of rains, I am giving my two cents here:

I was in Thailand last year in May, it was amazing times, people are always smiling to me and everything is cheap, there was few hours of rain sometimes during the day, but it never harmed my plans and it was refreshing and I felt special as a tourist there, I returned with thailand blues

I decided to return again the same year, and I return in mid December and in NYE to join friend to celebrate NYE
There was no rain, but I find it packed with tourists, even places like Koh Lanta and secluded places in Krabi that I was in, I just see taxi jeeps full of tourists and tourists everywhere
What bother me is that I got different vibes from people, I didn't see that smile from everyone giving me service, I was basically one more tourist from the many exist in that area

also to add that flights, hotel prices is 2-3x at least

So for me, I would take without regret few hours of rain in low-season over no rains in high-season and this situation

EDIT: just to reply comments, in both times I went only to southern Thailand, so this post doesn’t include experience from Bangkok or the north