I can't believe I have to say this, but:
- don't use trans as an insult.
- don't use trans as a punchline.
You see, when you try to insult someone who identifies as a woman by saying she's trans, one of two things is happening:
- She's trans, and you're using who she is as an insult.
- She's not trans, and you're using other people - trans people - as the insult.
Either way, what you're saying is that trans is less-than, that trans is something about which to be ashamed, that trans is somehow dirty or sinful or disgusting.
The same is true for jokes. If the punch line is "she's trans" or - worse yet - "she's a man," you are saying that there's something inherently funny about being trans - that just the existence of a trans person is laughable.
And when you make trans into something bad or laughable, you reinforce for trans people the lie that they are bad or laughable. And this can add to anxiety, depression, lack of self-worth and, in many cases, self-harm.
It also gives some other people the idea that trans people have less value. It leads to discrimination in employment, education, housing, and public services. It leads to rape, beating, and murder of trans people.
And if you don't care about trans people, and you're not concerned about the harm these sorts of insults and jokes can cause, there's something else I want you to think about:
These insults and jokes are cheap and lazy.
If the greatest intellectual rebuttal you can formulate is "she has an Adam's apple" or "I bet she has a penis," you're not in the debate at all. You've admitted defeat. What you're engaging in is called an "ad hominem attack," and it's the equivalent of the schoolyard response "oh yeah? Well... um... you smell!" It's beyond weak: it is an act of ceding the intellectual ground to your opponent, while you yell "nanny nanny boo boo." Just stop it.
If the best attempt at humor you can muster is "and she was a GUY!" you clearly need to work on your material. Andrew Dice Clay had a run with "Oooh! I said something dirty!" as the punch line to nearly every joke, and that was still a lot more clever than this joke. If you can't come up with better laugh lines than this, you might consider letting someone else be the life of the party, because you're not bringing much to the table.
But seriously, stop it already. It's weak. It makes you look stupid. And it's harmful to a group of people who have done nothing to harm you.
I really shouldn't have to say this now.
I don't want to have to say it again.