How is calling out Hillay AND GW "sidesing"?

See how narrow your focus is? It's not your fault, we're all served Kool-Aid every day. YOU may choose to drink it or not.

So we must both sides if Trump is wrong (so as to excuse his behavior) but not both sides to excuse other's behavior? Help me out here, just trying to understand how and when I'm expected to both sides an issue