1) Alienating 2) Contentious 3) Discordant 4) Dissentious 5) Factious 1) Creating dissension 2) Discordant 3) Dissenting 4) Dissentious 5) Factious 6) Rift-causing 7) Rift-provoking 8) Side-splitting 
• (a.) Creating, or tending to create, division, separation, or difference. • (a.) Indicating division or distribution.
Di·vi'sive adjective [ Confer French divisif .] 1. Indicating division or distribution. Mede. 2. Creating, or tending to create, division, separation, or difference. « It [ culture] is after all a dainty and divisive quality, and can not reach to the depths...
forming or expressing division or distribution. · creating dissension or discord.
causing or characterized by disagreement or disunity causing or characterized by disagreement or disunity causing or characterized by disagreement or disunity