The Red Skull goes there:
I guess you can't blame the Skull. After all, he's on a parallel world where the nazis won the war and Cap never hooked up with Sharon Carter.
And he's hardly the first to question the teen sidekick. "I always felt if I were a superhero, there's no way in the world that I'd go around with some teenager," Stan Lee once said. "At the very least, people would talk."