My friends won't quit criticizing me about daycare

My friends all have older kids than me (13-17, and I have a 2 year old) and they won't leave me alone about how he needs to be in daycare so they can "whoop his attitude in shape". He's two! Two year olds throw tantrums! I'm a stay at home mom. I've told them over and over I don't want him in daycare, especially if I'm not working. But they don't let up. And it's not even when I'm asking them for advice. I'll be over at their house, and my son will be whiny and they just lay into me about how he needs to be in daycare. I just don't understand why they won't let it go. It's not their kid. They've stayed their opinion over and over again and there's no need for them to keep going on about it. They say he should be talking more and dressing himself by now. I think since its been so long since their kids were little that their memory is off a little. I get that that's what they did with heir kids but honestly, they put their kids in daycare out of necessity because they both have to work. They didn't do it because they thought it was better for the child like they keep telling me my kid will better off for it. I'm lucky enough to where I don't have to work, so I choose not too. I'm not wrong for not putting my kid in daycare, right?