I'm 22m and my friend is about the same age as me.

The situation goes as following:

I want to play a game with my cousin, we're both on a Discord call maybe with a few people. Then first his girlfriend joins the lobby (I'm friends with her), then another friend joins. This is our usual "group" for this game, nothing out of the ordinary.

Then I hear a call sound, it's the last friend calling all of us in a group chat that he made. I thought to myself "Oh this is weird, we 99% of the time just use my server" (the server that my cousin and I are already in. So immediately I'm confused, I don't join the call because I'm in the call with like 2 other people, at least one of which I was trying to screenshare my gameplay because they weren't sure if they wanted to try it.

I put out a message asking why the private call and the response I get is essentially "join or don't". From this message, I'm upset. I just want to know why he made a new group chat instead of our usual medium. My cousin joins their call (probably because his girlfriend is also in it but who knows), but I stay and wait for an explanation.

I don't leave call immediately because I was showing a friend the game (via screenshare) then that's when he finally tells me that one of the people in the call (not the person I was sharing to) has been making them feel uncomfortable. I TOTALLY understand this. I'm a (relatively speaking) very understanding and emotionally intelligent guy and I would have tried to find a solution or accommodate his needs in any way I could.

"Why can't he just tell me why?" I thought. We end up playing an entire round of the game where I was excluded from the call. I was bitter for feeling disrespected and I was still trying to show my other friend the game and by the end of the game my anger was bottled up.

To not make this a REALLY long post (as it already is) I'll just say that my argument was "as a friend I deserve at the bare MINIMUM (if not a full explanation) of a 'I don't feel comfortable talking about it right now' or a "I'll tell you later'" and his argument is that he has the right to not provide an explanation. (He doesn't want to explain his trauma, which I was NOT asking for, I just wanted a response in any shape or form). I disagree because friendship is simply a two way street of respect, while I find that he certainly has the right not to give me an explanation, it's an utter lack of respect and trust not to provide me with a reason to not reply let alone an explanation. I've been friends with him for 2 years and we talk often.

TL;DR: I (22m) play game with cousin, friends join. One friend makes a group call instead of where we normally talk. I ask for an explanation or reply. My friend says he has the right not to provide one. I disagree, saying that friendship is a two way street of respect and that I deserve the minimum of a message of some sort.

AITA for being upset &/or lashing out in this situation?

Feel free to comment or PM me if you have any questions at all.