小子你别作小心被人戳姑娘你别傲小心被人草
[xiăo zi nĭ bié zuò xiăo xīn bèi rén chuō gū niáng nĭ bié ào xiăo xīn bèi rén căo]
This username combines a warning against arrogant behavior for boys with the same message of humility for girls. However, this carries a cautionary message that if you act too high-mighty, you'll face social backlash. The phrase includes slang terms, so it could sound quite blunt or informal depending on the context.