These things he's never been before. He's become embarrassing. My father doesn't fit most of the descriptions for Alzheimer's or dementia. He lives independently with some help from family (we do all yard work, repairs, some house work, taking him to some dr appts) He handles cooking, driving, his finances without issue. But in the last year he's had big personality changes, very rude and demanding to people like servers in restaurants, he compulsively talks to strangers even when it's plain they aren't interested in conversation, he's loud and has a mean streak. All of this is foreign to us. He's always been courteous and kind. It's become harder and harder to be around him, but more so to take him places. Anyone else experienced this?