Knowledge is power.
Generally, people are good and accommodative in nature with new people in the office. When some new person is joining in the office, his / her colleagues will try to help them and see that they settle well there and get adjusted. They will try to help the newcomers in searching for a house for them and try to introduce all the new areas in the city so that they will get accustomed to the new environment. Initially, there may be some problem for the newcomers but over a period of time they will get new friends and they will understand the local people better and will have a normal life.
It was only after a few visits later that we knew the real reason for his discomfort. At first he doubted us as from customs/CID etc. He also had doubt whether we are there for some illegal matters. The base for that was there used to be some unwelcome activities. So he was advised to keep an eye on all strangers coming there.
At that time we did not know the seriousness of the matter, but now when I recall it in the light of things reported in media I am happy that we returned harmless.