I hated both Alexis and Erynn then after I played every path and tried to be open minded, I had turned a new leaf for Alexis, not for Erynn. For Erynn I said I need some more information and did not change my mind on her. Though, I am mostly joking about Erynn and her possible horrible, painful death.
I also thought the same for Alexis but changed my mind about it. I think even though she handled terribly the Erynn situation, she did not have any bad intention about it. Being boring and simply not liking her is personal preferences but I understand, even agree on some level. She is a little bit too much clingy for my taste.
I think you are underselling how awful she was in that situation, she knowingly went behind the back of her best friend who she knows has unresolved feelings for this boy...
I think people making light of that aren't placing themselves in the characters shoes, if you had a friend that fully aware that you have a huge crush on a certain girl, made moves on her behind your back it wouldn't feel so good...
And her justification is that she was just "too involved", again much like you don't buy into what Erynn says, i don't buy into anything she's saying...
You became too involved in 2 hours? Upon seeing this guy that kissed you once, 5 years ago and you never saw again? A kid you barely knew?
And then there's the hypocrisy... if you tell her what she's done to Layla(pizza place scene), she gets on her high horse and judges you.
Plus other similar scenes where she gets to scold the MC for similar things to what she's done and it doesn't even occur to her.
From the POV of my initial plathrough of the game, i was banging Alexis because she (suppousedly)was offering no strings attached pussy, passing the time until someone more interesting comes along(but with potential to grow), she immediately started to show her clingyness which doesn't win you points but ok... but when it's revealed that she's hurting someone that i have a much bigger connection and much stronger feelings for, that's it... no coming back from that.