Not your bad at all, the Internet's bad. All it takes is someone to make an assumption based on Song of Ice & Fire (which is how this one started) or similar and it ends up getting repeated until it is 'fact'.
Even reputable websites will tell you Ser is a female or 'genderqueer' version of Sir used since Mediaeval times in England. Complete fabrication but it takes a lot of delving to find the truth, as you discovered! =)