Is it a bad thing for a guy to expect his g/f to look decent when going out?

No she should have looked presentable. If she was mocking you she wasn't the best girlfriend and i understand that she smelled and had holy clothes and that's disgusting. If I was wearing that and my bf put me in check I would've been a little hurt but I would be happy he came up front with me. She shouldn't have made you feel like a turd. You didn't confront her in front of people did you? i hope you took her aside to tell her what she looked like. She probably thought you were being self-centered and that's why she got mad but actually you weren't.So know you're not a jerk and she practically tried you and disrespected you