Well, it kinda is "other" than a penis, since you don't pee through it.
You have the right to use language as you see fit. You have the right to tell others that their use of language offends you. But you don't really have the right to tell other people how they have to use language, because that contradicts their right to use language as they see fit. Deliberate hate speech is an exception, but trnsboi's use of language was clearly not hate speech.
I don't care if you call it a dicklet or a chicklet or a case of beer. I just find it offensive when people try to control other people's use of language, when that use of language is not deliberately meant to offend.