John said, “Master, we saw someone driving out demons in your name. We tried to stop him, because he wasn’t a follower like us.” Jesus told him, “Don’t stop him! Because whoever is not against you is for you.” Luke 9:49-50
As Christians we should love everyone so that we can win them for Christ but we shouldn't tolerate what they practice and what is against God according to the Scriptures. The disciples were not ok with someone using Jesus name but Jesus made them aware that they should learn to tolerate anyone who is in line with what they are also doing.