This idea that there are numerous frivolous lawsuits filed is just a myth. Yes spilling coffee on yourself is your own folly. However it is a foreseeable folly that if you sell millions of cups of coffee a day people will spill on themselves. So if it is more likely than not that giving them extremely hot coffee with no warning will make their folly worse then you have liability. Again, just because a small number of frivolous lawsuits are shown in the media does not mean it is the norm. It's very similar to all the tragic covid deaths of young people the media would show last year. They love to publicize the exception and ignore the norm.