I F 14 went drinking with some friends and now they’re acting weird?

I’m a 14 year old girl and I’m having some trouble understanding a situation going on right now.

So, 2 weeks ago I went drinking with a few of my friends, and I know this may annoy some people but it’s pretty normal at the school I go to and it was really just to have fun. I went with two people from my school both 14 and a few other people from another school, but we were pretty much the same age all of us. The guy from my school that also came to the party is of course my friend and he came willingly, also he knew about the party before I did. This party was the second one we had, and he came to both of them.
At school after the party everything was fine between us, but as soon as some people found out about it, he started acting a bit off as in not engaging in any conversation with us (me and my friend). Later the other people in his friend group who we are also friends with started acting weird as well. One of them who is a really good friend of mine and his, first assumed that we forced him or influenced him to drink or go to the party at all. Some examples of their behaviour are that they; haven’t really said hi or started any form of conversation with us, also they’ve been acting pretty mean like saying shut up if we talk and not really wanting to talk to us at all. Me and my friend are kinda confused as to why it started now and not right after. I asked one of my friends about it and he said he thought we weren’t talking to him/his friends and that they shouldn’t start a conversation all the time which isn’t true.
I really want to keep being friends and clear misunderstandings so do you guys have any idea on why they’re acting like this all of a sudden? We don’t want any lecture just a solution to the issue as it’s confusing us because they didn’t seem to have a problem with it before.
I F 14 went drinking with some friends and now they’re acting weird?
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