Overall, I've never been to a place where it was easier to meet new people and make new friends. I liked Chiang Mai more than Bangkok, but they're definitely two of my favorite cities ever. Koh Lanta is also a paradise.
I'm planning to go back in January again. The lifestyle there is perfect for me at this point in my life (28 year old web developer).
Some pics from my trip: https://drive.google.com/open?id=0B45Al_n9xsrna25kZ0RFdXBOb0...
Far more likely to get chatted up in the West than there.
The Starbucks example is very exaggerated unless you are very very good looking and luck, and even then I am sure it would happen every time.
All in all, just because you go to Thailand your "alone" situation might not change in the long run.
That being said, I do agree with coming to Bangkok and it can definitely be an amazing time. And to directly address the 'girl' focused aspect of the comment, dating here is a very relaxed and fun experience.