Player multi-classed wrong and took it out on another player who pointed it out
Kinda just want to vent, don't really need advice. Also I am new to Reddit so bear with me.
Key players:
Druid/Bloodhunter (D)
Bard/Sorcerer (B)
I've been playing D&D with this group for a little over a year now but only joined the campaign with this player towards the end of last year. The group had leveled up right before I joined and so I didn't see the level up process for that one. At the session before last we got to level up again (to Level 7) and our druid (D) made minor complaints about having to bump his wisdom because he doesn't want to bump his wisdom. (Kinda stupid to me as a druid main who knows that wisdom is highly important to being a druid but whatever life goes on and people play how they want.)
This player is known for using magic items and racial abilities far more than using his druid spells or abilities simply because everything he throws at a monster gets saved against. Again this is because he has such low wisdom and refuses to adjust it. Anyway, because of all of this, I've never really noticed that he's got another class he could pull from. He's also only played one campaign before this one and it was with this same group so I don't know how knowledgeable he is of D&D.
Now onto the issue. At our last session, he declared that he was going to use a level 7 druid ability and our bard/sorcerer player (B) realized this shouldn't work as we are level 7 characters and D has one level in bloodhunter meaning his druid level should only be at 6 and he wouldn't have access to that ability. This was a shock to me as I hadn't realized he had a bloodhunter level. However, D was apparently already having a kind of rough day but seemed to have tabled that for the game until now. From that point on, D was disengaged or constantly harping on B both in and out of character. D kept griping about how B ruined his idea and would bring it up every few minutes or so that he was actually at the table (he frequently will get up from the table once or twice during the game to take a call from his kids).
This honestly makes me a little put off of wanting to play with D but I love the rest of the table and we generally have a good time. Some of the other players (B included) and I have talked with the DM of this campaign about D's behavior and that it was seriously uncalled for. So, that's being handled.
I'm just confused as to how it could've gone this long that no one else noticed he was a level higher than everyone else because he was multiclassing wrong. I'm also confused as to why he would multiclass when it seems he's just wanting to play a straight druid despite not wanting to optimize for druid.
Thanks for letting me vent. Have a nice day everyone.