Different prices for Farang and non-Thai Asian: Stickman put it that way, for lady bars, that non-Thai Asian are more likely to accept the first quoted price (which be an opening point for negotiation), whereas Whites are more like to negotiate.
I wouldn't call it a cruising place, it's a place of prostitution. Apart from incident in 2013 (analysis here https://christianpfc.blogspot.com/2024/08/dating-thai-boys-98-at-wrong-end-of.html) I consider it safe. I have taken 5 different boys over the last two years, two of them more than once. Details in my blog under gay activities of the month, or label street trade.
There is a short time hotel S hotel เสาชิงช้า nearby and I recommend taking the boy there. It's just 200 THB and if you take a boy back to your room, he would ask for 100 for taxi back.
The area is now easy to reach with about 10 min walk from MRT Sanam Chai to Saphan Hok (Lifting Bridge) สะพานหก, which I would say is the center. The boys are along both sides of the canal north and south of the bridge.
Most speak little or no English. I once spotted a Chinese ? customer using translation on his phone. When they are in groups, probably one can speak some English and translate for the one you like. Keep in mind most boys are straight, which limits activities.
Most customers come by car, however I prefer walking. It's busy from 8 pm on (which is different from 10 years ago, when it started 10 pm).