Sorry I’m not well enough versed in American politics to know who’s blue or red.

Whether you should vote or not doesn’t depend on the people around you. It is your right to have your say. The result is the cumulative effect of everyone in your area doing the same. Whether you think you’re surrounded by millions of blues or millions of reds doesn’t make any difference. Your perception may be incorrect, and your analysis, that there is literally zero chance that your vote will matter, is incorrect.

Nobody knows the results of an election until the votes are in and have been counted. It doesn’t matter that your area has always been red, blue, green, turquoise, pink or whatever. Areas can change allegiance, and it is by individuals getting out and voting.

If you don’t vote, you strengthen the position of those who vote the other way. It is not considered a protest vote because the system would prefer to consider this as voter apathy. If you want to register a protest vote and “none of the above” isn’t an option, find the official way to spoil your ballot paper and do that, but whatever you do, get out and vote.