Re: Handchecking in pickup games?
Assuming you keep good defensive position, you can use handchecking without being an asshole about it. If you can see someone's thinking about driving on you, a well placed hand on their ball-side hip flexor can hinder explosiveness and doesn't look too egregious. Just make sure you're always moving with the ball-handler as well.
On the other hand, if you're just slapping at their forearms while they're still at the top of the key after the check, no shit they're going to call you out on it.