>So... a teenager not being able to tell if people are serious when confessing to her, or if they're just joking, not interested in more than an S class relationship, or anything. Contradicts her making a statement later about not feeling liked.

It is astounding you still don't understand the difference between S Class, pseudo-romance, and romance.

S Class holds no romantic implication, they are confessing to her in a romantic way, thus not S Class.

This is why nothing you say holds any validity, I'm sorry.

Seeing as how you got this point wrong and the rest of the statement is based on it I'm going to skip it.

>The point where something becomes a cliché varies from person to person and trope to trope.

This is incorrect, it is based on how often it is used in comparison to the total number of works. Cliché are based on statistics, not personal experience.

>Experience reading the medium where it's a common part of the setting, experience reading other works where similar situations and relationships are part of the setting, reading articles about stuff like that online, and misc.

Citation needed.

>Oh, and the testimony of the author's own high school life.

I already explained why she's not good source on information.

>There might well be an absolute to how any one person will act, react and interpret any given situation, event or message or what have you.

>That absolute is going to be wildly different from person to person.

These two statements contradict each other.

>And nothing changes the fact that you roundaboutly stated that you have to be teary eyed/crying in order to be shy.

No, crying is a physical response that's the result of being shy.

>What do i have to be to be nervous?

Not sure what you're trying to say here.

>If there was only a few set ways of doing any given thing, and only a few set motives behind it, and everyone knew them.

You don't know them, why do you assume other people would? We are looking at this from a third party perspective, thus we have the ability to use hindsight. You are perceiving information in a way that's common to the trope, not how the characters would perceive it.