If you feel that another editor is being hostile or combative, the most important thing you can do is stay calm and avoid responding in kind. Wikipedia discourages personal attacks and generally rewards editors who remain civil and focused on policy—so long as you're right on the policy.
Engage professionally on the article's Talk page. Acknowledge the other editor's concerns where appropriate, and clearly explain your position. Read up on Wikipedia's content guidelines, especially about using sources. If you have a conflict of interest, note that you're following Wikipedia's COI guidelines by proposing changes on the Talk page rather than editing the article directly.
For more on how to handle this situation, read our How-To Guide on responding to hostile editors.
