why does internet assume one is "UPSET" because they ask a question?

If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck.

If so many people think that you're upset maybe you do sound like you're upset. Ever consider that?

Well, you seem upset in this very post. Use of pejorative phrases such as 'pussified generation' set the tone - and it's not a tone one would associate with neutral curiosity. All that stuff about micro-aggressions and social justice comes across as a bit rant-y, especially as it isn't entirely clear how it fits in with the main thrust of your post. And you compound this with the suggestion that 'people' don't know the definition of basic English words in very common usage (which seems, at best, unlikely, doesn't it?).

Now, it may well be a misapprehension that you're 'upset', but it's one you are - however inadvertently - inviting through your own use of language, and the slightly discursive style of your argumentation - so I'd advise that the fault (if there is one) isn't entirely on the side of your interlocutors.

You sound upset.

You seem upset that people realize when you're UPSET.

https://moviechat.org/general/General-Discussion/6186a6fa1cae401056025ae1/online-discussions-should-stop-after-2-days?reply=618744bc1d22bd2c3b9f75f1

We're living in a highly religious age. The mainstream religion is not Protestant or Catholic anymore, but Wokeness.

Religious people often see non-believers as upset and full of hate, and I'm not talking only about Wokeness. Here you have a (very good) couple of analysis in youtube about activist Christian movies. That's one of the core elements.
https://www.youtube.com/watch?v=Z9DVPoohilY
https://www.youtube.com/watch?v=50_3J6Go5Ng

The correct question would be "why highly religious people assume one is "UPSET" because they ask a question?". And... who knows?

My personal theory, though, is that highly religious people feel hurt by anything that questions their beliefs (questions, arguments, facts, anything). The pain can be high enough to be felt even as physical pain (I'm not kidding, there's papers and research about it). The unconscious train of thought is probably that if somebody is hurting them, the rational explanation must be that this person has to be upset or hateful. It's hard to explain that it's their highly religious views what makes them so sensitive when it comes to anything that questions their beliefs, that a simple question or the simple statement of a fact is enough to hurt them.

"Is this that pussified generation of people that fear everything is a micro aggression, assume social justice must be dealt everywhere, and look for protests in everything?"

As opposed to the pussified generation of people that saw (and still see) shadowy communist/Russian/Chinese conspiracies around every corner and need a 700+ billion dollar military budget to feel safe from all those scary foreigners, have spent half a century and counting trying to cancel Jane Fonda for saying things they didn't like, and assembled a lynch mob whenever they saw a black person drinking from a "whites only" water fountain?

A lot of people don't like being challenged and it is their response to it. Ironically it actually themselves who are upset not the person asking the question.

Because when someone defends his questions and attacks responses that don't support his beliefs, it is reasonable to believe that person is:

Definition of upset (Entry 3 of 3)
1 : emotionally disturbed or agitated
https://www.merriam-webster.com/dictionary/upset

Now the real question is, if someone was not upset why would he be acting upset by constantly saying he's not upset? Me thinks the lady doth protest too much.

You have to realize that your tone of writing is very different than someone who asks a question they have no personal holding in. It might be the internet's fault that you don't realize how your tone comes across, but there is a large amount of hostility in your writing that very much portrays the idea of being upset.