Why are girls so mean?

My lovely boyfriend and I went out to dinner at red robin last Saturday for our date night 😊 it was a great time with some delicious food 😋 we were at a table and behind is a little bit there was a mother and daughter in a booth. The daughter was maybe 16-17 and mom maybe 50's. When I was done eating I left to go to the bathroom and when I came back I saw the mom point at my boyfriend and the daughter looked and then they both laughed.... my boyfriend is 350 pounds and overweight... When I sat back at the table he told me as soon as I left they kept looking and laughing in their booth. My must people be so damn rude... My boy is the sweetest most caring man ever. And yet two terrible females have to make him feel bad... after we left he kept saying, they were right to laugh I shouldn't be dating someone like you. I'm not Good enough for you... it breaks my heart 💔