Sunnah : Do not exclude someone from conversation.
We should never ignore people or exclude them from our conversations.
It was reported that Amr Ibn Al-Aas (ra) said: “The Prophet (sallallahu alaihi wasallam) would give his full attention to even the worst people in order to create warmth between people, and he used to give me so much attention and talk to me until I thought I was the best of the people.” [Tirmidhi]
SubhanAllah at the manners and kindness of the Prophet (sallallahu alaihi wasallam). No wonder many of the companions (ra), who before islam were not of good character, became some of the best people after Islam!