On the secret relating to knights and princesses, I think it is incredibly ignorant of you to call the secret-teller sexist. Far from it, it seems to me that they are aware of how society is sexist and considers girls unable to be knights and boys unable to be princesses.

Also, I really take issue with how you phrase your responses - they often sound like attacks. You accuse this person of "perpetuating hurtful gendered stereotypes", with no evidence of this, and in fact it seems merely as though they are acknowledging stereotypes and not encouraging them.

Seriously, it wouldn't hurt for you to phrase things more politely, you can be incredibly harsh and assuming at times.