That was a lesson in coming for your the first time, that you have to pay expensive taxi ride in a short time to see Bangkok.
I had all that money with me too! & a Tshirt that said I'm a stupid tourist with lots of cash 5555
No, it was very inexpensive. It costs me that much to take a cab home from the airport here!
I got a cheap tour of Bangkok 5555 it was great!!!
I always try to see the positive in things.