Spammers are players that only uses signatures in brawlhalla over and over again. And yes, they're annoying.

Spammers always do the same heavy attack, or the same signature but they don't change their move set! They are the most easier to counter! Just wait their animation, find their faults (maybe in the hit box of the heavy spammed or the timing when they do their heavy), then react! If their heavy is a straight line with high range and priority (like lord vraxx's heavy side or val's heavy side), jump and light down at the end of his heavy (that's an example, you can find some other thing to counter this type of heavy). I mean, this game is really balanced, each heavy has a counter, just find it and then, be patient, this is the key to beat spammer!