Someone who only plays support

My friends and I often queue as a party of 3, 4, or 5 In draft pick norms. One of my friends ONLY plays support. Every. Single. Game they have to play support no matter what. A couple days ago we forced him to go into the mid lane and he even built the support item and Chalice of Harmony then complained about us making him play a different role. In the support role he also only plays AP Casters and typically he will play the same champions over, and over, and over. No differing builds or playstyles. He always backs the second he gets enough gold to upgrade the support item and never upgrades it fully. Normally he will sell this item near the end of the game and have a full ap build along with always taking the Dark Harvest runes. He never plays tanks and when ever we try to get him to play a different role or champion he complains and makes up excuses like "They are not in the meta" or "I haven't found any other champions I like" It's just so frustrating because when he wants to play other champions he will ONLY play them in Co op vs AI or ARAM and he NEVER plays ranked. It's just so frustrating because no one ever gets to play support and ADC gets boring when you have a constant Morgana stealing your kills with dark harvest then bragging about how high their KDA is or how much gold they got from the support item. Especially because he gets S's so often. Yesterday he reached 30 full keys but he has 0 chests because he won't play anyone else. When you play an AP Caster with a mid lane build as support, You don't need to CS because you're job is to poke and setup kills against the enemy champions. So of course your damage to champions stat is going to be high because that's all you do. It's just so frustrating for our team and I would like to see other people's opinions on if this is fair for us, or if he should be allowed to play what he wants. Or even how we could get him to try something else.