In my experience, the vast majority of Asians are assholes (like everyone else).
Because of this, when you meet a decent person, it has nothing to do with them being Asian, it's all to do with who they are as an individual. Thus, any individual from any nation could be decent.
I really don't get the culture thing. You might be thinking of historically based cinema rather than real life. I don't think you sound like you have much real experience in Asia, rather than just you've been lured in by certain types of media who're preaching to you to make money.
From my perspective, what do I like about Thai culture that makes them attractive? 1, women are more submissive and easy to control (and Asian husbands will probably expect a very submissive wife in return). 2, being smaller and with a better diet, they're less likely to get fat half way through your relationship and spoil your once decent sex life. 3, I don't really like any religons, but I especially dislike theist religions; Thais are more likely to be Buddhist and thus you don't have to find out on your 13th date with a girl that she's a Christian who's waiting for Jesus to return...
So there are some bonuses about Thai culture, but that's easily weighed down by the downs: 1, bad eating habits, not just in etiquette, but also, I don't like watching people eating raw crabs (shells and all), bugs, chicken featus from eggs, so on. 2, I hate the Thai monarchy and can go to jail if I say that in public; there's no democracy and the Thais love it, so long as the corruption swings in their favor. 3, I really dislike the slow development of their children due to their culture; you like Asians? I hope you like sharing a bed with a 1-16 year old step son/daughter if you marry a partner with children, coz those little critters cry like 3 year old white kids when they can't sleep with mommy at night (in most things, I find the Thai children are anywhere between 5 - 10 years behind white children). Things like this, the list goes on.
Not trying to bag Asian culture, just trying to bag you.