"I think Blanche didn't just love him but worshipped the ground he walked on! Adored him and thought him almost too fine to be human! But then she found out... This beautiful and talented young man was a degenerate" Stella
Stella provides context for Blanche's past. She believes Blanche didn't just love Allan but 'worshipped' him. Tells the audience she could have been obsessed with him - unhealthy which contributed to her meltdown after his death. "Degenerate" portrays the outlook of 1940s America on homosexuality - something that doesn't fit into normalised ideas of sexuality.
"Yes, I do, so refreshed. A hot bath and a long, cold drink always give me a new outlook on life" - Blanche
Blanche's need to bathe for a 'new outlook' shows its functionality as a cleansing ritual.
"That girl calls me common!" Stanley
Stanley's hate for Blanche is based on this attitude she has towards him.
[Blanche is singing in the bathroom a saccharine popular ballad which is used contrapuntually with Stanley's speech.]
Blanche's singing is present as the truth is revealed. Dramatic irony used to show she is unaware of her past being made common knowledge. Situational irony is used because she sings of love under illusions, while her illusion has now been shattered.