Yes, the problem is that every scammer and salesman uses these techniques also, and if you've run into a few of them, having a complete stranger approach you with the standard Dale Carnegie playbook immediately sets off alarm bells.
Also, there are counterexamples to that person's claim, such as the film Before Sunrise, which is an excellent romance film that doesn't involve an arc where the characters are indifferent or dislike each other at first. The films Sideways and even Office Space defy that trope as well.
FWIW I've seen none of the movies you list.