Maby kurt thought they would fake wrestle a bit.
That’s generally what they do on those shows.
Kurt was undoubtedly pissed for two reasons:
1.) He was not expecting/supposed to shoot for real
and
2.) Puder went against the storyline of putting Kurt over.
Unexpectedly getting your ass handed to you under any
(and especially those) conditions is enough to make anyone pissed.
Kurt had also just finished working a match, which although scripted, is still physically demanding.
The last thing he wanted was for someone to try it on with him to "prove something."
About a year before this incident, Kurt wiped the floor rather quickly with Lesnar in an impromptu backstage shoot the morning before a show.