[thezoid]

I'd say it depends. There's lots of things that can really throw people through a loop. Maybe you are using an editor they aren't familiar with, or perhaps you don't have your environment setup for gradle projects. There's so much more to this that we don't know. I'm willing to give the benefit of the doubt.

A way to get around excuses like these are to encourage people to bring in their own systems. Explain that you know how your setup might be awkward and it's probably better if they work on something they are familiar with. Besides, during the pairing session, you shouldn't be writing too much anyway.