It's understandable to want to help friends in bad situations.
Clara and George are talking about George's upcoming eviction over lunch together.
Clara wants to make George smile.
Clara offers her spare room to George without expectation of him paying for it.
Clara tells a joke about how George can make homelessness look cool.
George smiles in relief, feeling safe and closer with Clara than ever.
George fakes a smile to hide that Clara's comment hurt his feelings, and he feels more distant from her.