Is this a dumb line in one classic film?

It would depend on the scene and the characters. 

For instance, there's a similar line in Gone With the Wind that Rhett (Clark Gable) says to Scarlett (Vivien Leigh, a beautiful woman by anyone's standards, I'd think): "No, I don't think I will kiss you, although you need kissing, badly. That's what's wrong with you. You should be kissed and often, and by someone who knows how."

It's our understanding of their characters and their histories that makes those lines anything but dumb. She was a popular southern belle pined after by many men, and had been married twice by this stage of the story. But she didn't love any of them (including her husbands), so any kisses would have been passionless. And passion is what Rhett is telling her has been missing from her life.

Mind sharing what film you're talking about? 

Oh, okay.

In a way, I'm relieved. I wondered if it might be from some film I never saw, and I wouldn't be able to offer any useful observations. It doesn't surprise me about Maher, though. I've heard him talk about some films I know well, and he's gotten details about them scrambled more than once.

But it's really not too far off in this case. "You could use a good kiss" and "You need kissing badly...and by someone who knows how" pretty much amount to the same thing. And of course, it's more than just the kiss she needs. It's what it represents: a man who knows, understands, accepts and wants her for who and what she is.

That's the thing about Scarlett: she lacks self-awareness. Have you seen the film?

If you haven't, I don't want to give too much away. She begins the story as a selfish teenager who deludes herself into believing the man she wants really loves her, all appearances to the contrary. When the Civil War brings years of deprivation, poverty and suffering to her, she becomes hardened and ruthless. At the film's midpoint, when she's at her lowest, she swears, "If I have to lie, steal, cheat or kill, I'll never be hungry again." And before it's finished, she'll have done all of these things. Whenever the realities of what she's become in order to attain wealth and security are more than she can face, she simply dismisses them: "I can't think about that now. I'll think about it tomorrow." 
 
And through it all, she clings to the dream that the man she's always wanted will someday, somehow, be hers. She gets everything else that she wants, but it brings her no happiness because what she wants isn't what she needs. As Rhett tells her, "You've been throwing away happiness with both hands." He's the one man who could bring her that happiness because he understands her better than she understands herself, but she doesn't recognize it until it's too late...or is it?

The note of optimism on which the film ends reflects what makes Scarlett such a compelling character. For all her shortcomings, she displays strength, fortitude and determination even she hadn't known she possessed, and is a complex and fascinating figure.