I have a family member who is female, 40s, single. Very very judgemental while blowing her own trumpet constantly, self centred, only talks about herself, bossy and controlling over my DC. Desperate to have an issue, e.g if you have a headache her headache will be ten times worse, blames everyone and everything for her woes in life without taking responsibility for her own actions and outcomes. After a particularly horrible day with her recently we pulled her up on something in a very minor way which has since blown out of all proportion and made to be all our fault. She is now saying all her shitty behaviour is due to her being autistic and that we dont understand her. I think she is definitely on the spectrum but feel she is using this to excuse and legitimise her shitty behaviour. But how do i challenge that without looking like an arsehole?