When grandparents disagree

So we live with my boyfriends parents they are very nice but they haven't figured out he is our son not theirs. We went out yesterday and my boyfriends father took my son out of his carriage and told me I can push the carriage... Like wow ok I let him hold him the entire time we were out. Now they are arguing with me because I have early intervention and they think it's worthless. Ok that's fine I like it. And this isn't the first time they've did this either they decided to change his entire room theme (before we moved in) a friend of mine made a really cute marvel superhero crib set for me and they didn't like it so we use the jungle theme everytime I change it they change it back! Oh and I ordered his Halloween costume already because they already have planned on what they want him in! I'm sorry to vent but this is just ridiculous