am i fat bully?

So, all my life. i had ick about very very obese people, not overweight. So in high school, there were like 1 girl, who was soo arrogant and smug, idk why. And she would like talk with others like we low people, and shes of higher clan or something. And yeah i felt irritated by that. And there were some incidents, where it was crowded and i got like pushed around, idk maybe it was not intentional. But it was always her, and honestly i was petite, so i stumbled, got face planted. That incident was so embarrassing. And as we grew up, the guys who asked me out majority were obese.

And this one time, when me and friends were having lunch. So i bought fried chicken and salad. So she started to like, 'you are so cruel, how can you kill a life for 1 meal' I just laughed it off and ignored her.

So i, just developed ick, idk how, but thats i know thats wrong. But whichever very obese person i met they are either arrogant or idk too smug. what should i do, and im just 12th grader, im actually worried about my behaviour.