What is up with the quotation marks?

Why do people use quotation marks when they talk about their kids sometimes. For example, my seven-year-old daughter loves to arm wrestle with me. A lot of grown-ups would still say that she is “strong “. Why wouldn’t I just say that my kiddo is strong?

Also, why do people put the words for a kid after their sentences. For example, my four-year-old child likes to have races with me down the hall. A lot of adults would say that my toddler runs fast, for a kid. Why wouldn’t I just say that my four-year-old daughter is fast?

Also why do grown-ups respond with OK. Sure. Kid. Isn’t it dismissive? An example would be when my toddler stands next to me and says that they are really tall, why would I respond with OK. Sure. Kid.? it sounds a little dismissive don’t you think?