Why do people feel the need to....?

Why is it that I confided in a person once about my feelings towards my weight loss or lack there of, do they now feel the have free rein to give me advice on matters that don't even relate to my back. One was a few months ago at work I asked my boss if I could bring in a Yoga ball to sit on at work from time to time due to my back giving me problems and she tells me "you know when I lost my weight I stopped having back pain". Great for you but my back issue is due to a fractured vertibre and 2 car accidents that I suffered soft tissue damage now does my weight help it probably not but it is not the only solution to my problems I also must undergo chriopratic adjustments so that I stay in allignment and I am actually down to about 3-4 week intervals before I start haivng issues. The second instance was when I mentioned that my guys (husband and son) were home sick and she tells me well your working out right so you dont get sick and you know that if you have healthy hard working muscles you can carry a little extra weight, uhm what medical school did you go to (I think I will defer to my dr's opinion on that one). So I mentioned well last week we hiked two different trails in a couple of different national parks and she has the nevre to tell me well thats not a work out...Ok for my fat ass it most definately is plus it wasnt like we just strolled along we hike at a pretty good pace and chased (seriously) a two year old around the trails. Give a girl some Kuddos for getting her but up off the couch for almost a whole day of hiking and exploring. Nope instead she tells me I need to be running (now I was in track in jr. high) but I have never really been a Runner and I will never be one, I have knee joint issues already and a history of rhumatory arthritis in my family so I would like to do what I can to preserve what I can. Many may think I keep making excuses but there is a lot I can do I bike and I can do elipticals. I have some issues with the treadmill but I do push myself to do that and sometimes it takes alot out of me to hike but I get out there an do it. So I know many of you are thinking just talk to this person. I would but I am afraid of her did I mention she's my boss.