I'm 16M, the other guy in question, let's call him Sean, is also 16m.

So when it comes to dating and girls, what I do is basically hedge my bets: until I'm actually dating a girl, we're not exclusive. So until we actually start dating, flirting with other girls is fair game. And I like to to be talking to multiple girls at a time, so if one potential relationship falls through I have other options. 

Currently I'm talking/texting with 4 different girls, let's call them Emma, Ava, Julie, and Sophie. And to be clear, I never told any of them I was their boyfriend/we were exclusive. Basically, I'm trying to hang out with all 4, see who I like most, and proceed from there. 

And Sean, a guy I know, although we're not super good friends, seems very pissed at me for this. Whenever we're in conversation, he always makes statements here and there about me 'being a fuckboy' or 'hanging out with a bunch of girls'. I don't know if a) he just has a problem with me in general and is using this one issue to make it clear b) he actually has a problem with me talking to multiple girls c) he's just jealous or d) he likes one of the girls I'm talking to.

Either way, I didn't think I was doing anything wrong, until yesterday, Sean sits at the same table as me during lunch. He was doing his usual passive-aggressive roasting, and usually I just ignore it, but I was pretty annoyed, so I just looked at him and asked if he had a problem. He then proceeded to call me out for 'being a fuckboy'. 

I think he was out of line here. Aita?