A few months ago, I joined a private limited company. The issue is that in my department, there is a boy who has been working for the last year in the same company. The thing is, he does not speak with me, even if it is official - I don't need personal chatting. I suggested a new idea to management once, but he did not like it. Since then, he has been behaving this way. I am unsure of what to do, so please help in this case. We both have the same qualifications and experience.