What do you think about me telling my boyfriend to ignore my three-year-old next time I'm on the phone with him?
Wait, why would you want him to ignore your child?
Because I'm sick of him hearing the child and asking if I can put her on the phone.
Having a child distract your boyfriend from the conversation can be annoying but just think about how much he likes your child if he wants to talk to her like that. You should be more than happy to have your boyfriend want to entertain your kid.
You're just taking his side.
It's not about taking sides; it's about pointing out that it's a really good thing. Just try to think about how it would be if your boyfriend didn't like you child and maybe that can help you understand just how lucky you are.