Every time I type "upvote", a red line appears under it. I'm too enraged to add it to my computer's dictionary.

upvote isn't a word
downvote isn't a word
I know a lot of people use them on here but a lot of people also use "alot" and that's not a word either.

Let me welcome to the internet, where "upvote" and "downvote" are words. :)