Q:
What is Gw2 Policy About Verbal Abuse?
You can find your answers here: https://www.guildwars2.com/en/legal/guild-wars-2-rules-of-conduct/
or here: https://www.guildwars2.com/en/legal/guild-wars-2-conduct-breaches-outcomes/
or here: https://www.guildwars2.com/en/legal/guild-wars-2-user-agreement/
GM/Moderation/CS will never reveal the actions they take to anyone but the account owner said action was administered to.
Good luck.
Racist/sexist/anti-religious/anti-LGBT attacks are almost certainly dealt with. Same goes for death threats. More general trash talking like “You suck, scrub!” probably wouldn’t receive action unless it was particularly bad or the person has gotten multiple flags on their account for antisocial behaviour.