If you've done something before, say what it is. There are tons of people who give that exact same "I've been an entrepreneur for years and I'm changing the world" speech and are bloggers or "social media rockstars". It's not trying to insult you, it's an evaluation of someone they might rent from or do business with. If you've done things now is your chance to plug them too.
I'm guessing that by "freelancer" he didn't mean "entrepreneur", meaning he did work as an "independent contractor" for 4 years for other people but this is his first startup project.
