Food Shaming

I am so sick of the way I have been treated with regards to food my entire life until now. I am 41 years old 5'5" and weigh 126 lbs. My grandma would weigh my sister, my cousin, and myself when we would go over to her house as kids she told me to "stop eating" after a weigh in. I have never been above 129 lbs. So I did stop eating that day she told me that and I ate 3 grapes and that's all I ate that entire day. I was so hungry. I had an experience at Thanksgiving with my family and wanted 2 slices of pie one of pumpkin and one rhubarb and my uncle said "isn't that a bit porky?" Why do people care and feel the need to comment about what I eat?! At work people comment almost every day "every time i walk past you you're eating" or "how can you eat that?" when I'm eating my morning breakfast consisting of veggies and fruit. If I do get a burger (a portabella burger) my boss said he couldn't believe I was eating a burger. Why comment? It's food shaming. How is this okay?!