The beauty about street food in Bangkok is the people. I visited Bangkok recently [1], and absolutely loved the place. Most of the street vendors were warm, welcoming and showed genuine interest in the food that we liked rather than being touristy rip offs. Definitely would recommend visiting Khao San, Chao Phraya and the usual suspect places of Bangkok.

One more thing: If you're there, try the coconut ice cream, available in plenty around Chao Phraya. Such a delight.

[1]: https://suhas.org/bangkok/