Without knowing the specifics of what happened it isn’t easy to give you an answer. What do you mean by a bunch of scoops? Like 5 or 50? And what kind of cards were you hit with? If you were hit by bumholes then you were in the lead at the time, thieves then the person probably needed some scoops of a flavour you had, stray bullets then you were buying cards which makes you a potential threat to attack. Possibly the person was in the klan of the leader and was helping them out by attacking you.

Also some people are just pricks (see Bob above)and attack for no reason at all.