"Definitely not." Steve nods, sticking his tongue out at Robin as she passed before looking back at Billy. "If I had a problem with it, I wouldn't have a kid. Or have put up with the brats as long as I did."

Steve has always been a sucker for kids. He's always wanted to be a parent, a better one than his own had been. Even after he had his own kid he still wanted to help others, hence becoming a teacher.