Dilemma - My new BF is into model train sets and I don't know what to think!

An email from a girl who has borderline got the "ICK" over the train sets. This guy that she has been seeing left her in the sitting room one night to go out and play with them. And on a Friday night he told her that he couldn't go out with her as he had a new part that needed to be fitted!

She is wondering what to do - is this a red flag?