~snip~
There will be always stigma when comes to gambling and gamblers, that is not going to change as there will be always people who misrepresents the majority of gamblers how have common sense and understand what this whole game is about in order for someone to win, others have to lose.
Also, I have the personal theory those people who cannot accept the defeat and their bad luck during a gambling session and ultimately end up blaming the casino for their losses have a very distorted perception of gambling and betting, probably because they have been watching people winning big on social media during several months or weeks before they tried themselves to get money from gambling. From the very beginning, then they step in the casino, they already have high expectations and they explode when they are not met in reality.
Those people are not suitable to be gamblers and should invest their money in other hobbies and ways to kill time, it would make a big favor reducing the stigma and stereotypes society has on gamblers.
Initially, we all come to gambling with inflated expectations, and only after gaining personal experience (mostly negative) do we lower our expectations. Most likely, people who blame casinos for their losses have a gambling addiction. It is quite difficult to convince such people that they are the root of the problem, because their mental illness prevents them from understanding that all their problems can be solved simply by stopping gambling. In my opinion, such people need serious help, and the sooner the better.