I don't think it's reason to turn somebody down, but it can be fairly annoying using a library that doesn't follow standard naming conventions. If your code brings together four different libraries and they all use drastically different conventions (case, wording, parameter style, etc) it can quickly lead to a messy and difficult to maintain codebase.
Fair enough, I can definitely see that being an annoyance. Especially in the context of this being a light library, it's undoubtedly going to be utilized with any number of other libraries. Good point.
