Beginner Vintor TAID leech

I did it, I can solo now :DD. Beg. Vintor time attack instance dungeon (TAID for short) drops level 150 gear that can be down leveled cheaply. If you are reading this, play latale, and have a character at or around level 140 I can give you a free leech :). Leech= I do the killing and you are just along for the drops (except the 1st grade TAID boxes- those drop buffs and I need those to solo).

Big wall of text below...ranting time

           So yesterday on latale after I found out I could solo that dungeon (1/5 daily runs). I spent about 10m making a ridr set. I finish making the set and just hang around afking on and off for a bit. Then I noticed this girl Pika, she had an party index up asking for help with beg. vintor taid. Since I had already done a run I figured I would help her out and give her a free leech. I joined the party and she was like :D <3, and I was like :D <3. She had two other people in her party, there was Shanks (I think that's what his name was) who left shortly after I joined because he was too high leveled to enter beg. vintor (level 185 limit). There was also this other dude named CantBanMe, I offered to take him along too (he was 183ish and said he couldn't solo his skills were to slow). At this point I said I would like the 1st grade taid boxes when the run is over.
           We meet up outside the portal and CantBanMe said my gloves were crap. I was like "dude I can solo it doesn't matter if my gloves are 80% or 23% m-crit damage, I did a run earlier and had 15:31 when I beat the boss". Then he says my ballong is crap (47% max is really good on a ballong) and then adds that it doesn't have any min damage on it so its crap (max adds more damage than min...). He keeps insisting that I can't do it- which irritates me to the point where I said to pika that I would give her a private run because CantBanMe doesn't want me to leech him through the dungeon. Ofc as soon as I said that he enters vintor so I was like -w/e I'll prove him wrong-. So I enter and the *takes a deep breath* the guy has started the dungeon without me (aka timer is running).
          We continue doing the dungeon, Pika invited her other buddy along to so we have a full party, everything is going good. Pika died once and is on her way back, and the other person was invited late so she/he was still on the 3rd room or so. We get to the boss and we are at the 21 min. mark which is REALLY good (its a 9 min. run so far) CantBanMe is helping me fight the boss (even though I didn't need his help). Suddenly CantBanMe stops fighting, and thinking he has lag or something I keep attacking the boss and kill the boss. While I was still in my skill animation he runs over to the treasure room and opens the box...without anyone else there.
          When you open a box in a dungeon and people aren't there in the room with you they can never see the drop bags. So basically HE STOLE THE DROPS FROM NOT JUST ME BUT THE GIRL THAT NEEDED THE ARMOR and the other random person who I didn't talk to. He wasted my run, and wasted one of Pika's runs <3 QQ so sorry girl. Then after he hit the box and started looting he said I didn't solo he helped me (which is true) and then said I couldn't solo without him (not true) and just...ugh I left the party. I then blocked him.

TL;DR
CantBanMe is the crappiest of party members. He will steal your loot, and he will use you for his own gain. If you take him along in a degos party expect him to pick up your weapons just to sell them for ely. He is a solo player not a party player.