I don't think it's derogatory because some people really do smoke just to exhale big clouds, as opposed to getting as high as they can off of the tools they use. To them smoking/vaping is more of a ritual then a technique to get the best effects off of herb. It's like a lot of cigarette smokers who are addicted to holding the cigarette, feeling the smoke tickle their throat, and seeing the smoke come out of their mouth as opposed to actually being addicted to nicotine. The love of the ritual is why a lot of people don't like vaporizing. They want to break down the bud, roll it in some papers, hold the joint, feel the hot air, cough, exhale the smoke, taste the smoke,etc., so inhaling smooth cool vapor, and exhaling very little "smoke" is not fun to them. A lot of it has to do with age, because a young person who just wants to get high won't care because they haven't build up a connection to the ritual in their brain, and the things that come with it, as someone who is older.
For me I like clouds inside the water chamber, but I don't want to exhale clouds. The bigger the cloud on the exhale the more depressed I get because I know less is going into me. Now my technique is to load a small bowl & inhale at a smooth consistent rate, for at least 40 seconds after the bong gets thick with visible vapor, until I see no vapor in the bong, and my lungs are full of fresh air. Then I repeat the process over until I am blazed. Doing this insures I get a strong effect off of a small amount of herb, and waste damn near no cannabis vapor.