This colleague is very unpleasant.
First things first, I got this job because of my sister had contact of my current manager. One day, my manager told this in front of all of us juniors (not sure why). He hinted, but he didn't actually tell "You are here because of your sister".
And this unpleasant colleague keeps repeatedly testing my patience by telling to everyone "his sister got him here"infront of me to make me feel ashamed. I am not sure but this sound very unpleasant and unprofessional to me.
The most amazing thing is that he himself got here because of his uncle(mother's brother). He is no more than an average employee. Whenever I do better than him in tickets, he gets extremely nervous and the way to cope for him is to tell "I am here due to my sister". I really don't know how to react about this. I am ignoring this as of now.
The thing that it hurts is that at this point, I am very capable to go into any interviews for entry level roles like internships and trainee roles and crack the interviews.(I've cracked a couple just last few week) But should I tell that I am leaving my company because of this toxic behaviour of colleague to my current employee or to my future employee?
I don't want to be unprofessional. But this mentality of a person do deserve some response. How should I react?
It doesn't seem good to go to HR with this stupid reason,neither it sounds fair to talk with manager about this. He is really disregarding/domineering me and I don't feel good about that as a capable adult(in terms of job).