Big baby

So my baby boy is 15 weeks now and he weighs 8.9 kg (19.6 pounds) and he's on 98/99th percentile weight and height wise, 95th in head circumference. Currently wearing nappies size 4. Since birth he's gained weight like crazy, he never lost weight after birth and gained 1.5 kg in the first 2 weeks. I'm happy he's growing well, but I feel like whenever I met other moms and I try to make friends, after they see him and knows how old is he and how big he is they shut down and don't want to talk with me anymore. I had a situation 2 weeks ago that made me really sad, we've been in the arcade playing pool and some lady with a baby kept looking into our direction smiling like she wanted to talk. We finally caught eyes and came closer to start speaking with babies. She said her son is 1 year 5 months old and how old is mine, I said 3 months. She was shocked at how big is he and ask how much he weighs, I said how much and she said her son weighs that much, she looked shocked and a bit like scared? She said she need to go play and didn't look into my direction once after, like she was avoiding eye contact. I felt super excluded, like it's not my fault my baby is so big, so far I didn't make any mom friends after he was born and I'm scared he'll not have any friends either cause of his size. Does anyone have/has a similar issue?