Everyone is so focused on themselves that they're not addressing the problem...you. The girl who wants to give you the makeup isn't the problem. She's trying to help you because you probably look like a raggamuffin and yes, she probably is offended by having to get all dressed up for work and you look like you just rolled out of bed.

Part of being an adult is doing things you don't like to do, especially when it comes to the workplace. You SHOULD be putting an effort into how you dress for work. It's called being "professional". It's not about sticking it to the man, it's about running a business, and the customers run the business. The way you dress makes a statement, and your customers/clients will get their first impression on whether you care about your company or the customers, and how you dress will give them that impression.

Since everyone is offering their own grievances on how they wish they can just show up to work in sweatpants, I'll offer mine. I work at an elementary school with no dress code. I am allowed to wear visible tattoos, piercings, and edgy hair. I can show up in my pajamas or sweatpants if I wanted to, but what message would that send to the staff and to the children? My dress affects my performance and first impressions. I have to look my best, and I don't have to wear make up or wear high heels to do that.