Harassment based on race, sex, creed, color, nationality, or sexual background is both against the EULA and the laws of the United States where the game is based, and as such is actionable.
Training and KS'ing are against the Play Nice Policy (PNP) and are reportable offenses. Camping of spawns is not recognized, but the first person to engage a monster, according to this policy, is the one that has the right to attack it to completion. Anybody who attacks after that with the purpose of taking the kill can be reported and will recieve a warning. Enough such warnings will result in their being banned. If this happens to you again, report them and petition immediately. I would suggest attempting conversation with the offender first, and if rebutted, report.