As a support, what's your biggest pet peeve from other players?

For me it's being with a team who doesn't understand what support pokèmon do.

For example, playing as Hoopa and using Hyperspace Hole. It's a great move but most players don't realise what it can do. Placing a hyperspace only to have the Gyarados avoid it to teleport back home and walk to lane, leaving me to get jumped.

I'd expect this in Standard but not Ranked Veteran.

I've had some game saving plays as Hoopa with its Ult and Hyperspace when people know how to use them.