Handling Accusations of Trademark Infringement?

Dredd2Kad asks: "Recently I've been accused of trademark infringement because of something in the metadata of my website. What are my rights? Should I stand and fight or let it go? Part of me doesn't care, because my website is nothing but a special interest group, the other part of me is mad as hell that someone has come to my place and threatened me. I feel the plaintiff chose to trademark something really generic (HardRadio), and my choice of metadata (hard radio) should be allowed some wiggle room, especially since I'm not a commercial entity like they are. Please read my story and let me know what you think. I know someone out there must have had a similar problem." In addition to seeking professional legal advice, what other steps can one take to handle these problems?