OP here and I think it was just their way of being encouraging of my own choices and not adhering to what I might think is what other people want for me. There's no harm in it, is there? Especially since their comment did have a light and joking tone to it. I appreciate their comment as much as I do the other ones and I'm really glad they're comfortable and happy with their bodies too.

There are a lot of issues that come with either extreme of dieting or not exercising or whatever, but there's no harm or foul here and these discussions never go anywhere good for anyone. Both sides have valid points and as someone who has been at both extremes of weight I'm personally just looking to be a little healthier and not have to get a new wardrobe.