Yes, that’s what happened. A chaser called in before the activator had asked for more calls and in doing so caused QRM to the all important final confirmation of the QSO. Ironic.
“bearing in mind that I will have been running 150 watts with a high dipole”
What difference does that make? Shouldn’t affect your receiver.
. 
Maybe 1 does 
(Key word being “occasional”). Both Phil and Colin make good points. Sometimes I sense a desire to punish perceived transgressors on the reflector. This is a fun hobby. As Alexander Pope said “To err is human; to forgive, divine”.
My wife sometimes says I’m perfect - but only when I can sense she doesn’t mean it 
Shift happens.
But this shall remind us all to “listen, and listen, and then listen again before calling.”
Ahoy
Pom