Can seeing a body transformation from someone strike jealousy?

Anonymous
I have been working out for almost 2 years and there's definitely been changes. I noticed a lot of people looking at me oddly. Outside of saying that I am going to the gym after work I really wouldn't talk about it. I would just go have fun at the gym after work. Eventually

I got major results (all naturally) and people started acting different toward me. I didn't really realize my results until I put photos together side by side. My family loved seeing the results but then some people at my job were giving me odd reactions. The main thing that got my attention was 2 different people getting mad at me for not saying hi to them. They were just people I didn't notice really or honestly talk to all that much but the anger was definitely there. It was like they made it a point to go out of their way to rage at me for not saying hi to them. I don't brag or flex or any of that so I don't fall under the "cocky gym guy" stereotype.

There was also one really major situation this obese guy made where he was trying to act tough to this other guy who lifts weights so the weight lifter challenged him to a bench and I jokingly made a comment that I wouldn't talk to him if he didn't do it. Well apparently, this ticked him off big time and everytime we passed by he took offense when he saw me until he tried confronting me and I told him to leave me alone. He then saw me on the way to lunch heading to the bathroom to wash up, ran into a stall, vomited, left work early and started ranting on my Facebook wall.

Is stuff like this jealousy?
Can seeing a body transformation from someone strike jealousy?
16 Opinion