Support can only go for flash/exhaust?

so i have been playing support quite a bit recently and come to enjoy the role more and more. i mainly play champs like {{champion:412}} and {{champion:25}} which i think heal/flash is really good for. but most every game i play now, there is allways someone on my team that judges me and says that im a troll support for picking heal instead of exhaust. like what? heal heals your ally and gives you a speed boost so why is this such a bad option for support players?
Report as:
Offensive Spam Harassment Incorrect Board