Am I being unreasonable???

My partner accidently left chicken dippers out of the freezer after cooking some yesterday MIL sees this and decides to cook them (instead of just putting them back in freezer) and gives most of them to the dog and leaves like 6 on a plate for us in the oven. This morning I get annoyed that she has done this when I see how many she had left for us and complain about it to my partner who is annoyed that I'm complaining and says that me complaining is ruining the mood of the whole day . I then move on and start sorting some fruit out for our twins and start squishing some blueberry on a plate for them to eat only to notice that there is cigarette Ash on the plate and mention this to my partner (as she claims to be smoking outside ) and he gets annoyed at me again and says that I am just making the day awful and I need to stop complaining just cause I don't like his mum. Am I being unreasonable for getting annoyed about these things and complaining to my partner about them ?