Should I stop being friends with someone who constantly disrespects Islam online?

Assalamu alaikum, everyone. I need some advice. I have this friend who is an atheist. Alhamdulillah, I'm trying to be a good Muslim and make my iman stronger. But this friend, they don't say anything bad to my face, but on social media, they are always posting things that mock our deen. They make fun of the Prophet (peace be upon him) and the Quran, and they share things that are really hurtful. I've seen them do it to others too, not just me. I know in Islam we should be kind and patient, and not cut ties over small things. But this is really bothering me. Is it okay for me to end this friendship? I feel like it's affecting my faith and making me upset. JazakAllah khair for any advice.