Using accurate and respectful language is the foundation of being a good ally. Glossary of Terms: Transgender - GLAAD
If your goal is to find or celebrate the beauty of transgender people, Understanding Respectful Language
The phrase you used includes a term—"tranny"—that is widely considered a derogatory slur when used by people outside the transgender community. While some individuals within the community may use it as a reclaimed term of pride or in specific subcultures, major media stylebooks and advocacy groups advise against its general use due to its history of dehumanization and association with violence.