Reporting "Supports"

Is it a bannable offence, to play say, full AD ezreal support, no wards, pushing out waves, and stealing ADC CS. While I am completely accepting of people playing off meta, even as a support, though preferably something that at least has some form of actual support in their kit, such as Nunu at least being able to slow, and ATK speed buff, even shaco can pop an ADC going full AP and use his boxes. But when someone registers as support, and plays a champion with no support power, like Ezreal, Kha zix, Kayn, Smite support roaming singed. and then spends the game taking CS and denying our ADC, is that reportable, and what under? Because this really ruins games, and mostly just tilts everyone on the team off the face of the earth.
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