He's probably just not very good at timing. The jokes are standard light laugh jokes, but they seem to be misplaced.
The lightsaber for one, there's also the droid crashing into the wall in the big tense scene with Snoke and also the lightsaber hitting Rey's head. So for me it's not that the jokes are super bad (cause let's face it, it always had shit jokes), it's that they've been plunked in places where we are meant to be feeling tense or intrigued.
I guess an example would be imagine if Luke grabs his lightsaber after the tense scene with the emperor and he's watching his friends die, but instead of Darth Vader stopping it, it flys around the room and hits him in the arse.