Crazy. Completely agree about not smashing the thrust levers too. No need at all.
I will say that very gently disarming the speed-brake lever is silent and can be too subtle for PM to start the after-landing scan. Yes, if they look they can see that the spoilers have been disarmed, but they will be looking out to ensure safe taxi, and/or looking down to change frequencies, so might not notice straight away. The click from tapping the lever down is easily heard and gives PM an audio cue that they can do the scan as soon as able.
Note I am NOT advocating smashing the lever at all, just tapping it to generate a 'click' sound. What happened to the lever in that photo above is totally unacceptable.
After take-off is a different matter, triggered by a different cue. In that case, the lever can and should be gently pushed, to avoid inadvertent deployment, as stated by others.