Is OTHER wrong in the post ? POST : So my (17F) brother (19M) is pretty unhygienic. if I don't tell him to wash his hands, he won't do it. Sometimes he'll stroll into the toilet and leave the door wide open while he shits, when our mom and I are in the next room over and I'll have to yell at him to close the door. Sometimes he even doesn't flush the toilet and our mom and I have to be the unsuspecting victims.

He NEVER washes his hands after using the toilet and when I hear him come out of the toilet straight after flushing I have to ask him to wash his hands, and often he'll throw a strop and barely run his hands under water for 2 seconds. The other day I told him to wash his hands and he called me a whiney bitch and said he was going to shower in a few minutes anyway so it didn't matter. I've tried numerous times to tell him to make it a habit to wash his hands, I even hung a sign saying "Please flush &amp; wash your hands" on the door.

Anyway my older sister who's moved out gave me a custom-made mug as a gift, one of those that has an image appear when it's filled with a hot drink. I was showing my brother like "yo this is so cool" and he said "let me see" and grabbed it out of my hand to look at it. I immediately got disgusted, took it back and said "don't touch it" and my mum was like "whoa you're brother and sister, why can't he see?" and I said "I don't mind [brother] looking but God knows where those hands have been, I'd rather he not touch anything of mine." He got offended and said he hadn't even used the toilet today and his hands were clean. First of all I didn't mention the toilet once. Secondly, you see earlier that day I had gone to the toilet and saw piss in it with the toilet seat up and he's the only guy in the house so I kinda assumed he was lying and said "So not only are you disgusting but you're a liar too." He stormed off and has been pissed with me since then.

I didn't think I was out of line at the time but I do feel guilty now and my mom said I was absolutely the one at fault here and because we're family it shouldn't matter whether he touches my stuff, and I overreacted and treated him like an outsider. My sister said I was at fault for "insulting his pride" instead of trying to help him improve himself. Sorry if this is trivial. AITA?