A person is only a condescending a-hole if they actually walk up to the fat person trying their best and say mean things to their face. What I think is my own business and so long as I keep it to myself while at the gym I doubt I'm harming anyone.

John I could care less if lazier people are at the gym "taking up the equipment" for a very simple reason: most of them can't last on it long enough to be of any serious impediment to my workout schedule

You do what you have to do, I for one don't care what other people are doing when they're working out because I'm too focused on my own. When I'm training I'm TRAINING, and the look on my face and in my eyes are fierce. It's a miracle if I can find 5 minutes to ogle some of the hot gym bunnies in between reps.

As for fat people at the gym, they don't even register on my radar, to the point I'd almost trip over them because that is the degree to which I avert my eyes

Live and let live, but don't whine afterwards that "you've been going to the gym for months now and haven't lost a pound", which is a popular whine fit people are all too tired of hearing from people they've seen first hand slacking off throughout their workout.