It's never enough to leave someone out. They have to be shown that they've been left out. Just can't resist putting it all over social media, can they?
I find it interesting but depressing that women in particular question their own sensitivities before they question the behaviour and motivations of others. It isn't an oversight. You actively asked if anyone had plans for the weekend and were stonewalled.
Were I in this position I'd take the following view: if people are more into the passive-aggressive, grand gesture than having an open, adult discussion with me about whatever it is they perceived I'd done to piss them off, then I have no time for them.
There are few forms of behaviour I despise more than this form of PA cowardice. Such people are a disappointment, falling some way less of what any reasonable person can expect from mature, functioning adults.
I couldn't be arsed to have a scene with them, or grovel to them asking 'what have I done wrong' (thus taking their bad behaviour upon yourself when it isn't you, it's them). I would take the broad hint they intended, step back, and drop them from social media and elsewhere.
They've shown you they are no longer worth your time.