In my experience, its best not to get involved in behavioral aspects of team being engineering lead. You need to get work done and such things change the contex

In my experience, its best not to get involved in behavioral aspects of team being engineering lead. You need to get work done and such things change the context of your conversation. But if this is visibly affecting delivery quality or timeline then it makes sense to get involved. If it comes to that, I would defend my team member until proven guilty. Ask for specific scenarios and then if they seem serious then just pass a word to team member that there is heat around this issue. And he / she could have said this or handled this way. Sometimes people are what they are. It doesn't occur to them that they are offending others. You also can't expect them to change without patience n guidance. Keep sharing scenarios and what he could have done better. If this is behavioral problem then he would take time to come out of it.