I have this creepy uncle

S first off I do have to say that he isn't all mentally there. He's an alcoholic and that mixed with some other stuff kinda damaged his brain. With that said I have issues with guys touching me, even family. I'm only really ok with hugging my stepdad, grandpa, and uncle B, let's call him that for privacy, it's been that way for me for years. I never really had an issue my uncle in-laws don't push. But when my creepy uncle came back into the picture he'd almost demand physical affection. He'd corner me, try to bribe me, and ask my parents if he can hug me. At first I tried to out right make it clear that what he was doing is upsetting me. That did work, my parents just told me I'm making a scene. I have to stand with my back against the wall so he can't come up from behind me, but I'm the problem. I..my anxiety use to come out as little OCD ticks like washing my hands constantly, taking days simply deep cleaning my room, organizing things ife it was still a mess, not touching door knobs or washing my hands after. I can't touch stuff that he has without feeling dirty, like scrub yourself untill you're a few shades lighter dirty. I want my mother to care but I doubt she will. She probably tell just don't feel that way. She's has a way of being incredibly dismissive, and I know if I don't we're just going to have another 'he's mentally I'll talk'. I love I my mom and i know she loves me I just wish she loved me enongh to care. I guess I can try to talk to my aunt about it.