I think totally. 100%. If Wikipedia is to be believed

An ethnicity or ethnic group is a group of people that perceives themselves to be different from other groups based on shared attributes. These attributes include having a common language, culture, common sets of ancestry, traditions, society, religion, history, or social treatment.[1][2] The term ethnicity is sometimes used interchangeably with the term nation, particularly in cases of ethnic nationalism. It is also used interchangeably with race.

Then I think that your ethnicity could be based on the internet communities you exist in.

Its directly related to things like the slow dissolution of regional accents we see due to the internet and the general melting, appropriation, and reappropriation we of cultural aspects we see facilitated by the internet.