It was just an observation?

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Has the Princess ever decked you for that sort of observations?It was just an observation?![]()
Has the Princess ever decked you for thatsort of observations?
Has the Princess ever decked you for thatsort of observations?
IT DOESN'T MATCH
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Has the Princess ever decked you for that sort of observations?
Obviously, we are in disagreement here, but I see no disagreement in my grammar. In my sentence, 'that' is modifying 'sort', not 'observations', so it is correct. If all of the observations are the same kind, then 'sort' is singular, no matter how many observations have been made. (And if I know Sour, he probably has made lots of observations!)lady![]()
That sort of observation
Or
those sorts of observations.
Agreement .... All singular or all plural.... No mixing