My crisis of faith

Over the past several years on social media I’ve seen time and time again that my Christian brethren are routinely posting racist, hateful, sarcastic speech on social media, while at the same time proclaiming Jesus as their savior.

My question is that can I still worship with these people and call them brethren?

I’m having a crisis of faith because I assume that folks would act the same in person as on social media.  Not so.  It’s a Jekyll and Hyde phenomenon.