Rant - partners family

Yesterday we went to the local fair with my partners family. It was 23 degrees and we were sat in direct sunlight. My baby is 8 months old and she had her suncream on and sat in the shade of her pram permanently. Issue 1: my father in law went to pick her up. She had her hat on and he took it off saying ‘ we don’t need this silly hat’. I said no she needs her hat. He then laughed and said ‘she’s not Dracula she doesn’t need it’. I said oh no she needs her hat. To which my sister in law put it on her. This then caused me and my partner to have words separately. Issue 2: my mother in law was holding my baby she then goes to give her some fried popcorn chicken ‘just to lick’ my partner jumped in thankfully. His mum and dad then began to tease us. His father in law said here give her a chip. My partner then looks at me and I said if it’s got salt on don’t give it to her. They then start laughing and taking the mick. ‘It’s a chip of course it’s got salt on’ ‘she will be fine’ etc. my mother in law is having our baby for a few hours today and following everything that happened with the food she made a joke saying she was going to go for a walk and stop at the chippy for fish and chips with baby. To which I joked and said ok well we won’t be dropping her off with u then. I’m so upset with them they do things like this all the time and the worst thing is it caused a lot of divide with me and my partner. Please could you be honest and tell me what you think if it was your baby?