cEDH tournament, player resolved my gamble without my consent

Hi guys, I need help with oppinions. I was playing cedh at my LGS and I got really mad what happened after first turn. I played I believe [[wooded foothills]] and fetched for [[Blood Crypt]], then I played gamble, found [[Food Chain]] put it on my playmet next to other cards in hand and I asked player next to me to shuffle my hand meanwhile I shuffle my deck. Out of sudden, mumbled something about dont needing to shuffle rolled a dice and it popped 6 - which was the card I found. I said that I didnt aggree with that or anything and he kept insisting it's fair. I said I wanted to shuffle my hand, put it on playmet and pick one at random. Of course other way can be done with a dice but I need to aggree and choose 1-6 from left or right I believe. So I kept insisting on my version but also was he that it's fair, he is one of 2 owners who also participate in tournaments and I believe he makes a judge. It made me really angry and sad so I was out of my mind and didn't kept much attention to the game, i was even thinking about scooping so I can go home. Player next to me won and I shook his hand, packed my stuff and left. I have OCD and I often get triggered of these situations when someone is wrong and claims it as truth. Tbh, I was really happy after I won one of the previous games after very long time but what happened in round 4 final table really made me mad and sad at the same time and I don't wanna go back for some time.

Am I right, or is it fair as the player next to me claimed? Thank you.