I'm middle management in a school. I don't get a lunch break as it's an expected part of my job that we do lunch time duty (now doubled as we're doing staggered lunches due to Covid. As I'm pastoral staff my yearly salary is pro-rata'd to term time only. I get paid term time plus 2 weeks, the extra 2 weeks is to cover every lunch time I work plus 7 parents evening a year so it doesn't even work out to minimum wage let alone match my salary. Up until now we have been able to get a free meal as I work what would be my lunch break. This is usually a sandwich, bottle of water and a piece of fruit, eaten standing up as I'm also supervising students. Rarely I'll pick up something extra like a doughnut or biscuit if I feel I need a sugar rush but as I say rarely.
Due to the extra staff needed because of the staggered lunches teachers are being asked to volunteer and are given a free luch as 'compensation'.
Today I have been told I need to register my thumb print to get my lunch. I don't know if we are limited to a certain amount. The thing is the head teacher tends to make snippy remarks about what I'm (and the other women in my role eat) as well as things like the way we dress, make up etc. and I'm just not comfortable with him being able to track what we eat. I also feel that if he wants to argue with me about a biscuit when I didn't volunteer for this he can fuck right off.
I absolutely don't want to give him more ammunition and I'm prepared (although not happy) to just not register my thumb print and bring my own lunch in. We also have one of the strictest dress codes of any school I've worked in, I can't dye my hair the colour I want it, or have my upper ear piercing replaced. He also had a go at me for wearing trainers during lockdown, even though I explained all of my work shoes needed re-heeling and there were no cobblers open. I just feel that this is another part of me that has to become public property and don't want to do it. How do I explain this without making a scene?
[title edited at OP's request]