You're crazy

You're crazy and its ilk are a tactic rather commonly used to silence and dismiss feminist speech by insisting or implying that the speaker has some form of mental illness, with the implication that their speech therefore is invalid. This tactic is heavily supported by deep-rooted ableism against people with mental health conditions, as well as institutionalized and systemic sexism.  Racial minorities are also disproportionately affected.

It is a direct descendant and not much more than a word-swapped version of the now obsolete The woman's hysterical!

Framing feminist speech as "insane" can involve using the following tactics:

• Associating or equating non-conformity and pretty much any culturally rejected personality trait, no matter how natural, with mental illness. Can be weaved with respectability politics into a false dichotomy, in which "no wholesome woman would $ACT way because it isn't lady-like/respectable/Christian/whatever, therefore $ACT must be a sign of instability".
• Framing speech of oppression (especially personal testimonials) as paranoia, victim mentality, or delusions of persecution.
• Framing feminist anger as a symptom of a mood disorder. A form of Tone policing.
• Framing disagreement and straightforwardness as an unhealthy symptom. Also a form of Tone policing.
• Using any real or imagined history of psychological or psychiatric treatment or counselling as an Ad hominem "proof" that their speech is invalid.
• Concern trolling with phrases such as:

• "I get what you're talking about but this much anger just isn't healthy."
• "You sound really upset. Perhaps you should consider counselling to help face your extreme emotions."

• Playing kitchen psychiatrist and analyzing any act or lack of thereof as a sign of an unhealthy mindset, defensive mechanism, or outright disorder.
• Accusations of being paranoid or over-reacting may be used to dismiss real and warranted concerns of things like online harrassment and outright physical threat.
• Framing staying on topic or choosing and keeping a theme (in a blog for instance) as obsession.

Institutional sexism

Institutional sexism does exist in the field of psychology, for instance when sexist ideas on how women should act takes the place of what is normal. This can lead to systemic re-victimization and medicalization, especially when women facing intersectional prejudice (geek, nonconformative, WOC, sexual or gender minority, etc) are concerned.

In addition, due to the circumstances of psychological and psychiatric treatment and counselling, even individual-level sexism of a single psychologist/psychiatrist can have devastating effects, potentially doing more harm than good for the person. Outright malpractice can occur due to such prejudice, potentially resulting in a multitude of personal issues for the person and furthering negative associations of the mental health system.