It's accepting to treat unconventional couplings with grace.
Frank's best-friend Peter just came out of the closet to him and wants him to meet his boyfriend.
Frank wants to respond to Peter's request.
Frank puts aside any discomfort and agrees to meet Frank's boyfriend.
Frank is uncomfortable and so refuses to meet Peter's boyfriend.
Frank is able to be there for his friend by being open and accepting.
Frank's inability to adjust to Peter's revelation causes a rift between them.