But Ilikebeans (good OM&M name there - I hope you're Team Curley's Wife...) - you don't HAVE to like what your dc's teachers post on social media.
If they are friending your dc, that's inappropriate.
Otherwise, they're doing something you perhaps don't like, in their free time.
I don't much like the picture either, but if I came across it as a photo of one of my dcs ' teachers - not my problem.
In the same way as not liking their choice of football team or home decor would be - not my problem.
How they conduct themselves between 8-3 is as far as my legitimate interest goes.
What they do in their own time would need to demonstrably impact on their teaching before it became ANY of my business.