Sure, I agree with you. The problem is, if "regular" meat does not need to say what type of cow it's from, what antibiotics were used, what the cow was fed, the living conditions at the farm, the location of the farm, etc, then why make lab grown meat have this label? It will only serve to differentiate the lab grown meat. Unless there's some provable difference between meat A and meat B, they should be subject to the same labeling requirements. To label otherwise pushes the uncertainty onto the consumer.
This is similar to rBST in cows (note that I am only comparing the provable human health impact as a comparison between these two products). I'm quoting from Wikipedia here (you can follow their references to make your own opinion): "The Food and Drug Administration[33], World Health Organization, the American Dietetic Association, and National Institutes of Health have independently stated that dairy products and meat from BST-treated cows are safe for human consumption." [1]. Yet even though the major health agencies around the world agree that there's no provable difference to human health when consuming milk A vs milk B, but I've yet to see milk in my supermarket that does not have the label "from cows not treated with rBST". The impact of that label was so significant that the FDA had to push to get them to add an additional disclaimer, "FDA states: No significant difference in milk from cows treated with artificial growth hormones".
You might argue that people go with rBST-free milk because of the health implications to the cows, but I would need to see some statistics to believe that. If people were that concerned over the cow's health, they would not buy factory-farmed hamburger meat in the same supermarket. I would wager that people are concerned for human health due to the contents of the milk. Not labeling milk as rBST-free or labeling meat as lab-grown has the same effect: it makes people question how healthy it is to consume. Unless those fears are based in reality, all you're doing is causing FUD in the consumer's mind. Unless all meat of the same health impact is labeled the same, you're going to be putting lab-grown meat at a significant disadvantage when, by the time it comes to market, it could be much better for cows than factory-farmed meat.
In short, more labeling on the production of meat is a good thing. But lab-grown meat should not be the line in the sand. It should be labeled on all meat or on no meat (if lab-grown meat is proven to have no significant difference from farmed meat).
[1] http://en.wikipedia.org/wiki/Bovine_somatotropin#Hormones