Your still hurting the network in a way as your taking without giving back which means the networks supporting your client and not getting anything out of it. Not that it really matters I think he just wanted to point out that it will damage the network as more people are doing it
I certainly understand that point of view, but I thought that it was generally understood that as Bitcoin continues to get more popular, there will be a diminishing percentage of full nodes compared to SPV/lite nodes. Of course it's always good to encourage the use of a full node client, but I see no reason to discourage the use of an SPV/lite client... just my 2c.