Same thing happened to Sheamus. People started booing and being indifferent towards him as a face due to beating Bryan (but kids still bought his merch.) WWE eventually "listened" and turned him.
He got that initial pop with the crowd getting themselves over with the
You Look Stupid chants. Soon those chants faded away, and what was Sheamus left as? A random heel.
They even gave him MITB and a cash on Roman (who you all claim you hate so much) and the crowd was fukking silent:
The man who took the belt off Roman Reigns with authority help coming out to CDQ
I don't even have to go into the League of Nations
Now he's stuck putting over a guy they called up way too soon from NXT.
Nice and out of the title picture, and successfully "punished" for going over Bryan. When you really trace it back that's all this is ever about. The smart/internet fans want anyone who "crossed" Daniel Bryan out of the way. They took the whole WWE vs. Bryan thing WAY too far and are ruining the product and other characters now. They want payback for Rumble 2015 and Roman to float back to the midcard and the best chance this happens as.... a heel! Wow Imagine that?!