I don't think there's a joke here, or at least I'm not reading it this way. If anything it's not about "weaklings" but about being in an area where people are m

I don't think there's a joke here, or at least I'm not reading it this way. If anything it's not about "weaklings" but about being in an area where people are more likely to sue a business if they aren't warned beforehand - a street vendor elsewhere will not ask because their risk profile doesn't include being sued by someone who bought ice cream from an ice cream truck. Like if you walk into a store and they offer you coffee or even a glass of prosecco, I would also say to my wife "oh we're in that kind of store now" because you know you're about to be ripped off in some way. Not that other stores are for weaklings.