"Hey mom"

So my step-son is a huge joker, he's always playing pranks. Well one of his favorite things to do lately is call me mom in public. It's very clear im not old enough to be his mom. He looks older then me lol. This has got me some very weird looks from people when he does this.
The first time was in the school office. Caught me way off guard and I ended up making myself look dumb trying to explain things. Im not even 10 years old then him @@ Lucky for me the people in the office saw some humor in it. Unlike the Football Booster moms. Wow what a tough crowd!
I have 0 incommon with these women. Most of them are in their 40s, and here Iam a 26 year old step-mom. Im sure gold digger and homewrecker have been used when talking about me. This is the only time our age difference has come up.
So far all the kids friends parents i've met have been nice and very welcoming. So thats a plus. I guess i shouldnt even let this get to me. We're happy and the gap in age truly never comes up between us. Gotta love judgmental soccer moms.