Everyone who is not an annoying spambot is welcome here. Even if someone has repeatedly done very harmful things in the recent past, they are still welcome here. No matter what you do, you will not be forcefully kicked out. If you want to ignore people for your own wellbeing, that is always acceptable, no matter the circumstance. Take care of yourself first, always. If someone causes problems then those problems will be individually handled by administrative actions. Such actions may include: put on moderation queue, removal of PM privileges, regulation of subaccounts, but most importantly, individual conversations where the people who caused the problems can be helped to get better.