It's the gutteral reaction, the instinctive reaction. Just because Scotty was there at Khitomer doesn't mean he doesn't still harbor some sense of resentment when he sees a Klingon, after all as a part of Starfleet he'd had it drummed into him over many, many decades that the Klingons were the enemy. You don't shake that over-night.
I'm not saying he's going to pull out a phaser and start trying to burn Worf's ass with it. But after WWII it took a long time for those who lived through that conflict to completely set right in their minds that the Germans/Japanese are no longer and enemy, even though logically they knew it to be so. The rational part of Scotty's brain of course knows there's peace between Starfleet and the Klingon Empire, but his instinct is still to flinch when he sees Worf.
So, I can completely understand why Scotty acts like he does around Worf.
That said, if he had been on 1701-D for a longer period of time, he'd probably get to know Worf better and feel much more personally at ease with him. I'm certain that on some level he'd be willing to try.
I'm not saying he's going to pull out a phaser and start trying to burn Worf's ass with it. But after WWII it took a long time for those who lived through that conflict to completely set right in their minds that the Germans/Japanese are no longer and enemy, even though logically they knew it to be so. The rational part of Scotty's brain of course knows there's peace between Starfleet and the Klingon Empire, but his instinct is still to flinch when he sees Worf.
So, I can completely understand why Scotty acts like he does around Worf.
