Ask someone what gender pronoun they go by, ask someone how they describe themselves and just like with someone's name - when you forget, ask again. Take time, have more conversation than less, write down things that you might need to remember. In any process of education, learning isn't immediate; it takes time and various different approaches to integrate it into our brains.
I want to remind us all that this process of unlearning language and culture that has been and is being used to limit, erase or violate each other and learning new terms that people have forged in direct response to the violence that they have experienced should be joyous. We are learning new ways to affirm and celebrate each other. We are creating more space for individuals to name themselves, we are creating bonds of solidarity, we are resisting a society that tells us our directives must come from 'above', from 'far away' or because that is what 'they' say, when in fact language and culture is created now, here and in our hands.