If you find yourself in the company of people who are gossiping about others and you are not able to leave them, even though you may feel uncomfortable being the only silent person present, you are nevertheless forbidden to speak loshon hora.

No person likes to appear dull or unsociable.  However, the consolation is in the reward for such silence which is in direct proportion to the difficulty endured (Pirkey Avos 5:25).  Remember: It is better for a person to be considered a fool throughout his entire life by man, than to be considered wicked for one moment in the eyes of G-d (Eiduyos 5:6).

Concerning such situations the following words of our Sages definitely apply: “For every second that one remains silent he will merit reward of magnitude that is beyond the comprehension of even malochim (celestial beings)” (Igeres Hagra). ~ Guard Your Tongue