Social media is not a good replacement for real life community (look through my comment history and you’ll see me expressing exactly that repeatedly), but we can’t be oblivious to the fact that for many children their only connection to fellow queer people may be online. If you live in a small town or community where there are no other openly queer people, or if your school, peers, and parents are hostile to queer people you won’t have much choice in where you find community.
Whether they acted out of malice or ignorance, they bear the same moral culpability for the consequences of their vote. They have a social responsibility to ensure they are informed and vote accordingly; everyone should be able to spot fascism and authoritarianism when they see it.