Antipsychiatry.
Antipsychiatry is not a term that has any clear, universal definition so the meaning of this term is generally entirely within the context of how it is being used. If a person publicly identifies themselves as being antipsychiatry, then I think it could be appropriate to ask that person, how do you define antipsychiatry? And they may answer you, or they may not. Either way, it is important to remember that no one should ever be made to feel that they have to explain their identity to others. It's okay to be curious, but it's also perfectly okay for someone to choose not to answer any questions about who they are and what they believe.
Okay, so another context in which the term antipsychiatry is used is when someone does not identify themself as being anti-psychiatry, but is being called antipsychiatry by someone else. In this context, the term anti-psychiatry is almost always being used as an attempt to insult or demean the person it is being applied to.
I think it could also be appropriate in a situation like this to engage with curiosity and ask, what do you mean when you say antipsychiatry?" However, no one should ever feel obligated to engage with a person who is attempting to insult them. Even if you can't prove with 100 percent certainty that whatever was said was intended as an insult, if you feel like someone is trying to insult or demean you then it is perfectly appropriate for you to choose not to respond.
So in conclusion, antipsychiatry is not a clearly defined term, it means different things to different people, but it can sometimes be used as an insult or to undermine someone's perspective.
Don't do that.
Don't be an asshole.