Oh desert_me that is terrible. What a horrible thing to say someone ( I certainly hope you have nothing to do with the person anymore). The advice from Mandie is spot on mate. Go back and re-read what she said to let it soak in.
Mate you CANNOT let other people rule nor ruin your life through stupid comments. I speak with the voice of experience when I say you have to ignore it and just move on!! I spent all my life listening to others and taking what other people said to heart and I let it affect me for literally years. I ended being huge! It wasn't until the last probably month and a half that something just clicked in my head and I decided that I was not going on any more diets and I chose to eat healthy and start to exercise. Yes it is going to take a long time, but instant results, through crash dieting etc only make you fatter in the long run. Thus also giving you a further kick when you are down.
You CAN do this and you can lose the weight at your own pace through sensible diet and exercising.
When you said that you tried to become a vegan so quickly, did you seek any advice from anyone?? Often people will just stop eating meat and think it is ok, but you need to replace the meat protein with other protein suitable in a vegan diet. I think we have a couple of vegetarians and vegans here on this site that may be able to offer you some sound advice if you do chose to continue a vegan diet.
Please don't listen to the harsh comments that were directed at you. You are the same person inside, no matter what your outside shell looks like!! We have to accept ourselves for WHO we are, not what we look, then once we love ourselves for who we are we can start to make some changes to what we look like. Keep your chin up and know that you have some excellent support here on this site. We are here to encourage and support you and even kick you up the bum if that is what you need us to do
. Don't think that you can't lose the weight, because you can!!