CHANDLER: Sometimes I Wish I Was a Lesbian
This is a great example of how, in everyday English, we are often pretty flexible with the subjunctive.
Most would English speakers agree that the best grammar would be as follows:
Sometimes I wish I were a lesbian.
However, it’s perfectly understandable to simply say “I wish I was”. This is true for business and casual situations.
It’s easy to understand, and is considered correct English to a lot of speakers.
Mignon Fogarty, Grammar Girl over at Quick And Dirty Tips can tell you more about this: https://www.quickanddirtytips.com/education/grammar/subjunctive-verbs