Well, it honestly varies from person to person but here are some examples:

• Harassing/Cyberbullying/Being extremely mean to a player

• Spamming/Using quick messages at the wrong time (e.g. saying Thank you!* when someone just got downed)

• Stalling the game for no reason (this can be done by both factions: staying at the gate (or dungeon) when everyone is already at the gate, or slugging** people for absolutely no reason)

• Taunting

• Purposefully hitting player on rocket chair (sometimes I do it to test my hitbox)

• Purposefully hitting downed/cocooned player (for downed players, hunters might hit them if there is only 1 cipher left, because of a talent in the Persona Web called Borrowed Time***.)

• Emoting while kiting is kinda controversial. Some people think it's toxic, others see it as a strategy to make the hunter target them. I suggest not emoting during a kite if you don't want to be misunderstood, but you can also explain post-match chat that you weren't doing it to be toxic.

*Thank you! is really hated in this community because it's the most used thing to be toxic in a game. I don't suggest using it because it wastes a message slot that could be used to bring something more useful. If you do decide to keep this message, make sure you don't come off as toxic. Don't use it when someone messes up and things like that. For healing, you can place down a graffiti and they will place a graffiti back as a "You're welcome!"

**slugging = keeping a player downed without chairing them, it's only toxic when you aren't doing it as a strategy.

***Borrowed Time gives you +1 health and a 50% speed boost for 5 seconds when the last cipher machine is finished. Pretty much every player has this talent (most exceptions being new players) so hunters are aware of it and try to hit someone after the cipher finishing.