What a hooha over lunch?!

I just don’t understand why this admin person at my office is so hung up about lunch hour. Today colleague A who always has to rotate with this admin person B, was on half day AM leave. So since A is coming in at 1pm which is also B’s lunchtime, I do not see the reason why I should have to be dragged into this lunch rotation thing. The basis for this lunch rotation is super dumb too as there must be someone in the office to answer any sales call. Come on, we are NOT a call centre.

Okie, so I refused to rotate lunch and told B that there is no need to, given the reason above. B can tell me what if A is late, A may not come in at 1pm. So what? Is that my business? In the end B said she will lunch at 12pm if I dun want to. I didn’t answer her as I couldn’t be bothered but B just walked off for her lunch.
Why this power play on lunch? Goodness, it’s just LUNCH. I am going crazy cos it has happened like at least 10 over times since I joined 4 months back. This is CRAZY. I am doing her a favour if A is on leave and I rotate with B, so she should keep her tone nice and not order me about. What the H***. I cant stand it.

I already DON'T interact with her 99% of the time. It seems funny she treats her family members so well and other big shots but is so mean to other colleagues or people. Perhaps really nice people are those who treat everyone with respect.

Sometimes I just feel like throwing in the towel. Right now. Maybe it's because I have been a supervisor before so I do not like people ordering me about, except my superiors/ boss. Maybe I should just quit.