Why is vegetarianism and veganism frowned upon? Why would someones diet offend anyone?

spoonman2014
My first experience with vegetarianism and veganism was in my teen years. I had a friend who was vegan and a girlfriend who was a vegetarian. I never understood the hate they received and I notice men seem to get more hate than anyone else with this. I tried vegan and vegetarian dishes before and I did enjoy it but I never actually made the switch until I left the military in 2014. Like many veterans I got fat. I gained about 30lbs and a lot of physical ailments started setting in, chronic back pain, my knees felt like they had arthritis, I was out of breathe, the gym felt like a chore, walking around my college campus was something I hated doing and my mood changed too. I was dating this one girl for about 6 months and in December 2015 she dumped me because she was still mourning the loss of her ex from years ago.
I became clinically depressed and I kept on thinking of ways to turn it around. I remember I seldom ate red meat before so I did that again and in an ironic twist of fate I noticed I didn't eat meat for a week because every thing is covered in bacon these days. I decided to against my own advice and "go full retard" to correct the years of damage done to my body. My mood improved, I lost about 40lbs in 6 weeks I couldn't believe it! My energy changed too and despite all these positive changes my peers ostracized me. I never came out and said I made the change they all just got really weird about it. They'd ask why I never ordered meat when we went out to eat, my own family went as far as putting bacon in everything for dinner at a cook out once. Even the sauerkraut had bacon in it... So for the veggies who read this, I'd love to hear your take and the meat lovers i'd love to hear how you feel also with open arms and no malice from me and hopefully everyone can be an adult in this conversation
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I really like some of the replies here
Why is vegetarianism and veganism frowned upon? Why would someones diet offend anyone?
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