Ana, this is one great example of how things out there in the real world are viewed so differently. There are likely to be many times like this, where you are reminded of how weight and weight loss are the huge priority for so many. What you do inside your head, I suggest, is to remind yourself of your non-weight benefits – privately of course. This is what I mean by taking a stand – in this case on motivation.
And by the way, I find that a few comments about health and nutrition often kills a weight loss conversation!