AITA for roasting my teammate

I usually don't post on reddit. However at this particular moment I couldn't resist.
The game is not even over and I just had to start writing. So I usually play Support, mostly 5, sometimes 4. I will tell you about a game where I played as the position 4.

I pick Undying as my pos 3 picks Centaur, seems like a decent choice especially as I'm facing 2 strength carries in the opposing team. I won't clarify any further as I don't want to see comments below in the style of "Tidehunter is not actually a favourable matchup". Just listen to my story, you might learn something about yourself.

Ok, so I feed first blood as well as a tombstone. Not a great start, but then I'm back to my lane where we are facing huskar and veno. Might have ruined my previous secret here but I think it adds to the story. My pos 3 dies but I manage to get a double kill. Good enough. I start dominating the lane and I see Centaur getting back to my lane. I think he misused a TP. I look at his items and it's a Bracer + mango. So I'm like, damn no regen is kinda tough in a lane against poison and flaming spears. So he gets to lane and gets pushed out directly, so I give him some regen and recommends that he should buy regen. So anyway, he just pings his Bracer. I try to encourage him again to get regen and get back to lane. But he just likes sitting behind our t1 tower and chill. Oh no I forgot, he pinged that he was 1000 gold away from a Blade Mail.

Doesn't seem like a great plan, but sure maybe he wants to play aggressively, but then I see that he is buying a lot of sentry wards. So he is now switching between standing behind the tower and dewarding. In the meantime, I'm just dominating the lane. Getting another double kill. I see there is a fight in the top lane so I TP and get another double kill. I am getting momentum here, just helping top lane so our void can secure farm.

Everything is just going great, and then something just happened. A few minutes pass
Me, Void and Chen gets into a fight which we lose quite narrowly. At this moment, Void starts asking what Centaur is up to. I have been so into my roaming around so I've just lost track of centaur.
The void asks if Centaur can join the fights and our pos 3 answered "farm". So anyway, he is just farming away , he has now queued up blink dagger. Void can't get any farm as our map is constantly shrinking. We are losing fight after fight. Centaur is away farming. Never uses his ulti, after we got ganked I politely asked if he could use ulti. Then he replied with "ask".

Consequently, we lost the game. Void didn't have items, I had gg but couldn't make an impact. We lose another team fight, this time on HG. I look for centaur and he is just farming away. Now he has gotten a Boots of Travel to move more freely around the map. But he still hasn't shown up to any fight with his boots, blink and blade mail-combo. So I'm just gonna ask him what is up with the pacifism and then I see he has bought even more sentry wards so at this point I just start laughing. No point in trying to win this, I am more focused now on just roasting the hell out of this Centaur.

So in all fairness, he was being quite rude towards my teammates when we were needing his help. We all tried to be very helpful. However, he tipped me early for a double kill and I tipped him for waving his white flag.