I am not sure on this one, what I know is that you could make the character in the beta smaller than the minimum height right now and the game didn't automatically adjust it, i.e. if you dont touch that small character by editing it, the size stays the same.Cant you create the small characters in singleplayer and then use them in mp? This stuff is around for half a year already shouldve been fixed ages ago or started banning people doing it. Since you cant really aim with your weapon vertically.
Some people don't give a damn about that, they configure their character once and decided back then, "I go small" and now just don't bother to fix it.
So I'd be careful with throwing the cheater accusation about this and knowing that ppl in all chat go quickly into combat mode when it comes down to stuff like that I can see why some people just not even bother to read. Heck, I've been called Autoblocker for winning against a swo/bo inf while having no shield.
OP might not be like this, not saying they are, but others might be and therefore people shut down.
This is something the devs need to fix and it's not warranting a ban.