If you replace "refuse" by "not bother to", the sentence suddenly becomes very believable. When you have dozens of resumes to sift through, and one applicant is difficult for no apparent reason, it's very easy not to bother. It's going to require a bit of effort to switch to the gitlab context and figure out the interface if the recruiter isn't used to it, which is annoying. Unless you already stand out for some positive reason, you don't really want to stand out for being annoying.