Based on that particular response from the CFI having been seen on multiple fora, and based on the forum posted responses to it that I've seen, I'd RUN away from that instructor as fast as I could.
He's telling you that you can't enjoy driving unless you have a CDL and are hauling a bulldozer across the Rockies in a blizzard. You only want to buy lunch. He thinks you ought to pay for a seven-course meal.
Regardless of what "kind" of flying you're doing, with a Sport Pilot cert, you can take a passenger, and meeting the limitations of the cert, you're FLYING. I am sure that most people who have actually been at the controls of an aircraft would consider that real aviation. If you are the pilot in command, you're flying. Period. Sure you're not going to land at O'Hare or Hartsfield, but you can almost everywhere else. All of the new LSAs out there are, by golly, REAL airplanes! You still have to fly them.
I'm sure I'm going to get attacked for this next statement, but it is MY opinion, and mine alone.
No one else is responsible for it: Many of the new LSAs are sexier, faster, more spacious, and better airplanes than some of the 60 year old stick and rag stringbags I've seen on some local airports. That's what *I* alone think, and I'm sticking to it.
I would much rather fly a brand new Sting 2 or RV-12, or Breezer than I would a Navion or Ercoupe that's older than my father. I'm sure those Navions or Ercoupes or Colts are fine airplanes. They're not what I want, and since it's my cash, I can have my own opinion.
You need to find an instructor who will teach you what YOU want them to teach, not what THEY think you ought to be taught. You want an SP, you get one. You find an instructor who is willing to give you what you want. It's your money, after all... Why not spend it with someone who is giving you what you asked for, instead of what they think is best for you and your personal mission?