@Coin There's no denying even the perception of judgement, whether true or not, can deter people - perhaps even some of whom could benefit the most from working out - from going to the gym. So incidents like this actually hurt more specifically because of how much attention was given to it since they propagate that impression despite the fact it's rather atypical.
Yes, it's anecdotal (given there's probably no objective way such data can be collected) that most gym-goers wouldn't care, notice or do anything to demean someone trying to improve themselves but it's a common impression reported by most people on the subreddits I keep track of; it's not to say this Playboy bunny was the only person to ever stoop that low (although taking a picture of someone showering was a ... novelty), there are occasional rants about things insecure assholes who aren't even fit themselves say to others, but... it's rare.
From my personal experience it's far more common for females who seem to know pretty well how to exercise receiving unsolicited help by concerned bros - come on, guys - than anyone to be glanced at twice because they pack more pounds than is ideal or whatever.
For the record the worst gym-goers tend to be teenagers and men in their forties. Everyone is self-absorbed to some degree but those two demographics excel at it.