Most lakorns are remakes, and the originals may go back to the 1980's or earlier .... Thai society has greatly changed since globalization hit in 1990's...
Many of the tropes in lakorns, including the "Hateful Male Lead" (credit to @Cheer, lol), the slap/kiss, the selling of females by family members, the idea of female "purity", etc... are all remnants of that time.
Agree w/ it or not, much of these are deeply rooted in Thai culture, and there is a clash among the old & young generation, the rural & urban society.
Many of the "original" (not remakes) lakorns, made from 2000 - now, don't have the abusive male, and they portray male-female relationships a bit more realistically, reflecting the changing society and changing values.... Unfortunately, these originals are very few.
Besides, like anywhere else, if the old formulas work, producers are hesitant to change the cliches....and slap/kiss genre is popular!
I can go on about how selling women and rape is viewed in Thai society, and whether watching lakorns is perpetuating the stereotypes and hindering the progression of women's rights in contemporary society, but that's another discussion.
--->>> So YES!!!... the Hateful Male Lead is prevalent in lakorns.... But just as prevalent, is the very, Strong, Smart, and Feisty females who never break ... it is the male that breaks down, reforms, and works at redemption.
Usually they are in slap/kiss genre, but most genres have a lead w/ a little bit of this trait in him!
--->>> lakorns of last few years have seen a dramatic drop in these types of male leads.