To me the comic is about reluctance to work with a newcomer. This could be anyone - a person from a different city who finds it hard to work with people who have known each other for quite sometime. I think it is natural for people to work with someone they know already than with someone who is new. I understand discrimination as being unfavorable to someone based on their race, color, nation and other affiliations. When it comes to doing it unintentionally, this usually happens due to some of the general assumptions people usually make based on these associations. Something like, K's country is stereotypically called as lazy, therefore every student assumes that K is also lazy, avoiding K. Somehow, not including someone to be a part of the group does not sound discriminatory without its reason. In my 5 years in OVGU, I have luckily never experienced any scenarios where I felt left out. Once I stumbled into a German session in acagamics and the students where kind enough to translate every word in English for me.
Diversity in Teamwork(Comic Strip)