There are valid reasons to vote and there are valid reasons not to vote.

As an example: many indigenous people living on land the US claims to own were made certain promises by the US government. These promises were made to their people as a nation, not to them as individuals. By accepting US citizenship and voting in US elections, they would be tacitly legitimizing the occupation of their land and also surrendering any claim to the land they were promised. In fact, the US government often attempted to force citizenship upon indigenous people whether they wanted it or not.

As a white person, I suppose I may as well vote, but voting is part of the corrupt imperialist system and therefore part of the problem, and I won't disparage anyone who has a conviction against participating.