Why? I could see if they were showing it to the kids in school but this was on their own time. Do the teachers have a history of pushing this nonsense on their kids? The article didn't say.
If you side with the school on this matter, then anything a teacher does in their private life, including posts on social media can be grounds for dismissal. This means a public school can dismiss a teacher for posting conservative memes.
In this case, the cure is worse than the disease
Public schools can and have dismissed people for posting conservative memes. Or even for sharing their views privately.
Maris sounds like a clueless person. Probably thinks she is hip or adventurously discovering the vast world of humanness and is now a fascinating person.
Put her in a sewage pipe. She will learn much more about humanness.
P.S....once they posted activity this online(publicly) it was no longer on their own time.