My mum is a functioning alcoholic and has been for years although it's got worse over the past 3 years since we sadly lost my dad.
She isn't a horrible or violent drunk. But I've found that as I've got old I find her absolutely intolerable when she's been drinking. Everything about the way she looks to the way she speaks enrages me. I don't have a problem being around drunk people in general, just her. She can be annoying but like I said, she isn't abusive as such she just talks rubbish. I've accepted that this is how she is and I can't change her drinking. I can't rely on her for childcare or for anything really.
Sober she is fine and we get along well but if I pop round and she's been drinking I have to leave immediately or we end up arguing. Im struggling to understand why her drinking has this effect on me where I literally cannot stand to be around it. She would argue that she's not doing anything wrong and makes me feel bad for leaving her on her own. But I simply can't be around it.