I'd suggest the following as evidence:

"Catherine feared, as she listened to their discourse, that he indulged himself a little too much with the foibles of others."

I've always loved that, as well as loving the little disapproving shake of the head which Henry's behaviour causes Catherine to make so involuntarily.

We all talk about Catherine's endearing naievete, but in truth, she gets Henry's number very quickly.

I think Henry realises that, too. On only their second meeting, he let's Catherine into his real opinion of Mrs Allen, for instance. When Henry points out that in Bath Catherine is "...in pursuit only of amusement all day long," she replies as follows:

"And so I am at home--only I do not find so much of it. I walk about here, and so I do there; but here I see a variety of people in every street, and there I can only go and call on Mrs. Allen."

Mr. Tilney was very much amused.

"Only go and call on Mrs. Allen!" he repeated. "What a picture of intellectual poverty!.....