I have nothing against vegans or veganism, but I am against it being thrust down my throat.
At work, a group of friends went vegan and every meal I had that had meat was met with judgement and hostility about how I am not considering the abuse that animals go through. This is not true, and I am extremely particular about the meat I choose and the welfare standards and I am a big believer of using the whole animal and not letting things go to waste, and the best way of honoring the life that has been taken is to make sure every part is accounted for.
I also went to get an implant fitted after the birth of my child, I was morbidly obese before pregnancy, but had severe HG and was just overweight after the birth of my child. The doctor inserting my implant thought it prudent to discuss my weight WHILST doing the procedure and instead of giving me legitimate medical dietary advice based on my medical information, PCOS and medications that make me gain weight furiously fast or referring to peer support groups, she wrote down a list of books about veganism I should read and preached about how I'd be saving the planet.
I came away from that appointment completely discombobulated but gave it a try anyway and ended up with an iron deficiency and on supplementation that made me vomit and backed me up so severely I developed hemorrhoids that then required a second hemmorhoidectomy and robbed me of my dignity. In the end I actually ended up gaining weight and only saw results for weightloss when I turned back to a meat protein rich diet.
As vegans enter my social circle, many of them preach and preach about veganism and about how I should try it, and I've just not "done it right" and I need to find the right vegan diet for me and none of them ever seem to take no for an answer.
In fact I never tell them they should eat meat. I'm highly respectful of their dietary choices. All of the hostility seems to be one way and it's all directed at meat eating.