The whistle was blown before the high five and was called on Evans for extending his arm and pushing gasol out of the way after he was fouled. Not that I agree that it was the right call but just saying it wasn't for the high five.
No it wasn't... When you see the replay later in the game they showed the angle from the other side and the ref did not call a technical until after Evans said something to Blake and raised his hand for a high five... You could read the refs lips wen Blake was talking to him saying taunting... The ref misread Evans motions before he completed it and couldn't take it back cuz he called it already