It seems to me that it's important sense in which this isn't true. The impression that I get—I would be delighted to be wrong about this—is that I'm welcome _conditional_ on observing the local speech rules. (There isn't an _official_ speech code, but there is a set of utterances that would provoke hostility and ostracism from everyone. As it should be: in an extreme case, someone who habitually shouted racial slurs and graphic descriptions of violence would not be welcome. An extreme case suffices to show that there _are_ rules, that there _is_ a line.) One could argue that this observation is trivial: when we say that someone is welcome to a place, there's always _some_ implicit condition. [TODO]'s status as a valued member of [TODO] is _conditional_ on [TODO] not being a murderer.