Am I being silly?

So I’ve been with my now fiancé for 3 years I’m currently 31 weeks pregnant with our first child. He has two children with his previous ex. Now recently we have been having petty arguments as we are both stressed but now I want to know if I am being petty. He asked his daughter to make him a cup of tea she said no. He asked me to make him a cup of tea I said no make it yourself stop being lazy. He said well (ex’s name) would have made one for me. I seriously feel like I sound silly but I don’t get how anyone would appreciate them making a comment like this?