I moved to Norway for work just under 2 months ago. The work is in the IT sector. My immediate supervisor is in the main IT department of the company where I work, and I was dispatched to another department for dedicated IT work there. Besides myself there are a few other people, one of which was quite friendly and helpful, and so my response was also friendliness and helpfulness, but something strange has begun to happen recently. The first occurrence, a week ago, seemed to be a verbal insult, but it was so unexpected and out of thin air that I thought (and continue to admit) that I had misheard something.
But the second occurrence was the following event: he went into my office to say goodbye, saw a restaurant brochure on my desk and started to "friendly" attack my shoulder with his knuckles, making sounds with his mouth, all seemingly in a "friendly" manner envying that I was going to order something tasty from the restaurant, or something along those lines. And the attack was quite painful (still feeling the effect). I was quite shocked, so I didn't know how to react and simply ignored it. Now I'm thinking how I should actually react to it. I realize that it would have been best to discuss this matter immediately, but I simply didn't know how to react, so unexpected and out of the ordinary it was.
That person is about 25 years older than I, has been working for the organization for over 10 years, and I'm still in a probationary period. I'm a member of a trade union.
What is most appropriate to do or not to do in my situation?
I'm not a confrontational person at all, I prefer to avoid conflicts, but it seems it's not always easy, especially when a colleague's office is located just a few meters away.