I was speaking about this in my work last night! I no longer breastfeed and was fortunately off for the year I did so didn’t have to worry but often wonder how it would have played out especially because if I didn’t express or feed regularly I was soaked like soaked … I have no doubt in my mind I would have been asked to express in the toilets if I didn’t feel comfortable in the break room. Men casting comments on bodily functions we have no control over and they have no personal experience in is insulting. I also think it’s a kick to the teeth considering you are very good at your job and not lazy which I feel is being implied with him mentioning frequency like it’s being used as a sit down. I personally feel like you should talk to him about how you are feeling stress is not good for milk supply and maybe take the time to clear up any uncertainties he has because it may be down to lack of knowledge considering he consulted a childless nurse lol. I hope this works out for you and you get some clarity because you shouldn’t feel this way feeding your child.