score:4
What constitutes 'trustworthy' or 'safe' very much depends on your own standards. I would say that Bangkok is quite safe. It's exceptional for tourists to be the targets of violent crime. But, tourists are an obvious target nonetheless, probably more so through scams than crime. Here's just one of many articles on the web that list Thai scams you should be aware of.
As a rule of thumb, you are more likely to be targeted in areas with more tourists. You are more likely to be targeted when it's quiet. You are more likely to be targeted, the more intoxicated you are. The more a tourist you look (that has a bit to do with your race, but more so with how you behave), the more likely you'll be targeted.
In my mind, no nightclub (anywhere) is absolutely trustworthy. The more expensive ones will probably try to scam you less, but their scam is the price you're paying, to begin with.