As someone who is overweight, and used to be quite larger, I can answer this. (I dont practice it though);
Its a test. Plain and simple. Does vanity rule your judgement? Is he wrong for this? Maybe. It shows a insecurity, well, rather a mis-trust of others, based on his personal experiences.
When your overweight, there is a greater tendency for people run in the other direction. Regardless of how much work you have done to get where you are at now. I get it often. My pictures are accurate. Though when people find out I'm overweight, they never respond again. Or create a sad excuse that contradicts all of their previous messages. (Yes, people do notice the mood change in the e-convo.)
The best part: I am overweight, but I still look good. I laugh when I run into people that previously ran off. Im nice, cordial, and respectful to them. However, they are held at arms length. Unless they are man enough to apologize. Thats happened too. I have a greater respect for them at that point.
While it may seem like a poor way to meet, (honesty and such), try empathy first, and understand why they do it. Judging a book by its cover is never a good idea.
Personally, I don't mis-represent myself. The fact that you dont see my "weight" in my pictures is for obvious reasons, however, I am factual on the numbers I put out there. Hell, in conversations, Ill bring it up sometimes, to make sure that the person isn't wasting my time. If you cant read, not my fault.
And thats not to say that I dont understand personal attraction. However if a conversation is going well, and then the weight comes up, and they run without a word after, they are a dick and a coward. plain and simple. Its the judgement that sucks.
Hope this helps on perspective.
I agree with all of the posts above.